From 5ada5b4027f733cde6132a29c28eea008cf16727 Mon Sep 17 00:00:00 2001
From: "Andrew C. Dvorak" <acdvorak@gmail.com>
Date: Tue, 3 Apr 2018 17:16:59 -0700
Subject: [PATCH] feat(infrastructure): Upload compiled screenshot test assets
 to GCS (#2500)

New NPM command: `screenshot:upload-assets`.

First, run:

```bash
npm start
```

Then, in another terminal, run:

```bash
export MDC_GCLOUD_SERVICE_ACCOUNT_KEY_FILE_PATH=path/to/gcloud-service-account-key.json
npm run screenshot:upload-assets
```

To avoid collisions between developers, every batch of files is uploaded to a directory with the following format:

```
/<bucket>/<username>/<timestamp>/<commit>/assets/
```

E.g.: `/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/`.

Sample output:

* [`mdc-button/classes/baseline.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/classes/baseline.html)
* [`mdc-button/classes/dense.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/classes/dense.html)
* [`mdc-button/mixins/container-fill-color.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/mixins/container-fill-color.html)
* [`mdc-button/mixins/corner-radius.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/mixins/corner-radius.html)
* [`mdc-button/mixins/filled-accessible.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/mixins/filled-accessible.html)
* [`mdc-button/mixins/horizontal-padding-baseline.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/mixins/horizontal-padding-baseline.html)
* [`mdc-button/mixins/horizontal-padding-dense.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/mixins/horizontal-padding-dense.html)
* [`mdc-button/mixins/icon-color.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/mixins/icon-color.html)
* [`mdc-button/mixins/ink-color.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/mixins/ink-color.html)
* [`mdc-button/mixins/stroke-color.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/mixins/stroke-color.html)
* [`mdc-button/mixins/stroke-width.html`](https://storage.googleapis.com/mdc-web-screenshot-tests/advorak/2018/04/03/23_00_32_993/5ca514fe/assets/mdc-button/mixins/stroke-width.html)
---
 package-lock.json                    | 1099 +++++++++++++++++++++++++-
 package.json                         |    3 +
 test/screenshot/.eslintrc.yaml       |    5 +
 test/screenshot/README.md            |   12 +
 test/screenshot/asset-uploader.js    |  131 +++
 test/screenshot/run-upload-assets.js |   34 +
 6 files changed, 1268 insertions(+), 16 deletions(-)
 create mode 100644 test/screenshot/.eslintrc.yaml
 create mode 100644 test/screenshot/asset-uploader.js
 create mode 100644 test/screenshot/run-upload-assets.js

diff --git a/package-lock.json b/package-lock.json
index 2af37a128a5..e6482646343 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2,6 +2,273 @@
   "requires": true,
   "lockfileVersion": 1,
   "dependencies": {
+    "@google-cloud/common": {
+      "version": "0.16.2",
+      "resolved": "https://registry.npmjs.org/@google-cloud/common/-/common-0.16.2.tgz",
+      "integrity": "sha512-GrkaFoj0/oO36pNs4yLmaYhTujuA3i21FdQik99Fd/APix1uhf01VlpJY4lAteTDFLRNkRx6ydEh7OVvmeUHng==",
+      "dev": true,
+      "requires": {
+        "array-uniq": "1.0.3",
+        "arrify": "1.0.1",
+        "concat-stream": "1.6.0",
+        "create-error-class": "3.0.2",
+        "duplexify": "3.5.4",
+        "ent": "2.2.0",
+        "extend": "3.0.1",
+        "google-auto-auth": "0.9.7",
+        "is": "3.2.1",
+        "log-driver": "1.2.7",
+        "methmeth": "1.1.0",
+        "modelo": "4.2.3",
+        "request": "2.79.0",
+        "retry-request": "3.3.1",
+        "split-array-stream": "1.0.3",
+        "stream-events": "1.0.3",
+        "string-format-obj": "1.1.1",
+        "through2": "2.0.3"
+      }
+    },
+    "@google-cloud/storage": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@google-cloud/storage/-/storage-1.6.0.tgz",
+      "integrity": "sha512-yQ63bJYoiwY220gn/KdTLPoHppAPwFHfG7VFLPwJ+1R5U1eqUN5XV2a7uPj1szGF8/gxlKm2UbE8DgoJJ76DFw==",
+      "dev": true,
+      "requires": {
+        "@google-cloud/common": "0.16.2",
+        "arrify": "1.0.1",
+        "async": "2.4.1",
+        "compressible": "2.0.13",
+        "concat-stream": "1.6.0",
+        "create-error-class": "3.0.2",
+        "duplexify": "3.5.4",
+        "extend": "3.0.1",
+        "gcs-resumable-upload": "0.9.0",
+        "hash-stream-validation": "0.2.1",
+        "is": "3.2.1",
+        "mime": "2.2.2",
+        "mime-types": "2.1.18",
+        "once": "1.4.0",
+        "pumpify": "1.4.0",
+        "request": "2.85.0",
+        "safe-buffer": "5.1.1",
+        "snakeize": "0.1.0",
+        "stream-events": "1.0.3",
+        "string-format-obj": "1.1.1",
+        "through2": "2.0.3"
+      },
+      "dependencies": {
+        "assert-plus": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+          "dev": true
+        },
+        "aws-sign2": {
+          "version": "0.7.0",
+          "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+          "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+          "dev": true
+        },
+        "boom": {
+          "version": "4.3.1",
+          "resolved": "https://registry.npmjs.org/boom/-/boom-4.3.1.tgz",
+          "integrity": "sha1-T4owBctKfjiJ90kDD9JbluAdLjE=",
+          "dev": true,
+          "requires": {
+            "hoek": "4.2.1"
+          }
+        },
+        "caseless": {
+          "version": "0.12.0",
+          "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+          "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+          "dev": true
+        },
+        "compressible": {
+          "version": "2.0.13",
+          "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.13.tgz",
+          "integrity": "sha1-DRAgq5JLL9tNYnmHXH1tq6a6p6k=",
+          "dev": true,
+          "requires": {
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+          }
+        },
+        "cryptiles": {
+          "version": "3.1.2",
+          "resolved": "https://registry.npmjs.org/cryptiles/-/cryptiles-3.1.2.tgz",
+          "integrity": "sha1-qJ+7Ig9c4l7FboxKqKT9e1sNKf4=",
+          "dev": true,
+          "requires": {
+            "boom": "5.2.0"
+          },
+          "dependencies": {
+            "boom": {
+              "version": "5.2.0",
+              "resolved": "https://registry.npmjs.org/boom/-/boom-5.2.0.tgz",
+              "integrity": "sha512-Z5BTk6ZRe4tXXQlkqftmsAUANpXmuwlsF5Oov8ThoMbQRzdGTA1ngYRW160GexgOgjsFOKJz0LYhoNi+2AMBUw==",
+              "dev": true,
+              "requires": {
+                "hoek": "4.2.1"
+              }
+            }
+          }
+        },
+        "form-data": {
+          "version": "2.3.2",
+          "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.2.tgz",
+          "integrity": "sha1-SXBJi+YEwgwAXU9cI67NIda0kJk=",
+          "dev": true,
+          "requires": {
+            "asynckit": "0.4.0",
+            "combined-stream": "1.0.6",
+            "mime-types": "2.1.18"
+          },
+          "dependencies": {
+            "combined-stream": {
+              "version": "1.0.6",
+              "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+              "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
+              "dev": true,
+              "requires": {
+                "delayed-stream": "1.0.0"
+              }
+            }
+          }
+        },
+        "har-schema": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
+          "integrity": "sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI=",
+          "dev": true
+        },
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+          "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-5.0.3.tgz",
+          "integrity": "sha1-ukAsJmGU8VlW7xXg/PJCmT9qff0=",
+          "dev": true,
+          "requires": {
+            "ajv": "5.2.2",
+            "har-schema": "2.0.0"
+          }
+        },
+        "hawk": {
+          "version": "6.0.2",
+          "resolved": "https://registry.npmjs.org/hawk/-/hawk-6.0.2.tgz",
+          "integrity": "sha512-miowhl2+U7Qle4vdLqDdPt9m09K6yZhkLDTWGoUiUzrQCn+mHHSmfJgAyGaLRZbPmTqfFFjRV1QWCW0VWUJBbQ==",
+          "dev": true,
+          "requires": {
+            "boom": "4.3.1",
+            "cryptiles": "3.1.2",
+            "hoek": "4.2.1",
+            "sntp": "2.1.0"
+          }
+        },
+        "hoek": {
+          "version": "4.2.1",
+          "resolved": "https://registry.npmjs.org/hoek/-/hoek-4.2.1.tgz",
+          "integrity": "sha512-QLg82fGkfnJ/4iy1xZ81/9SIJiq1NGFUMGs6ParyjBZr6jW2Ufj/snDqTHixNlHdPNwN2RLVD0Pi3igeK9+JfA==",
+          "dev": true
+        },
+        "http-signature": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/http-signature/-/http-signature-1.2.0.tgz",
+          "integrity": "sha1-muzZJRFHcvPZW2WmCruPfBj7rOE=",
+          "dev": true,
+          "requires": {
+            "assert-plus": "1.0.0",
+            "jsprim": "1.4.0",
+            "sshpk": "1.13.0"
+          }
+        },
+        "mime": {
+          "version": "2.2.2",
+          "resolved": "https://registry.npmjs.org/mime/-/mime-2.2.2.tgz",
+          "integrity": "sha512-A7PDg4s48MkqFEcYg2b069m3DXOEq7hx+9q9rIFrSSYfzsh35GX+LOVMQ8Au0ko7d8bSQCIAuzkjp0vCtwENlQ==",
+          "dev": true
+        },
+        "mime-db": {
+          "version": "1.33.0",
+          "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.33.0.tgz",
+          "integrity": "sha512-BHJ/EKruNIqJf/QahvxwQZXKygOQ256myeN/Ew+THcAa5q+PjyTTMMeNQC4DZw5AwfvelsUrA6B67NKMqXDbzQ==",
+          "dev": true
+        },
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+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
+          "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
+          "dev": true
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+        "qs": {
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+          "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.1.tgz",
+          "integrity": "sha512-eRzhrN1WSINYCDCbrz796z37LOe3m5tmW7RQf6oBntukAG1nmovJvhnwHHRMAfeoItc1m2Hk02WER2aQ/iqs+A==",
+          "dev": true
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+          "resolved": "https://registry.npmjs.org/request/-/request-2.85.0.tgz",
+          "integrity": "sha512-8H7Ehijd4js+s6wuVPLjwORxD4zeuyjYugprdOXlPSqaApmL/QOy+EB/beICHVCHkGMKNh5rvihb5ov+IDw4mg==",
+          "dev": true,
+          "requires": {
+            "aws-sign2": "0.7.0",
+            "aws4": "1.6.0",
+            "caseless": "0.12.0",
+            "combined-stream": "1.0.5",
+            "extend": "3.0.1",
+            "forever-agent": "0.6.1",
+            "form-data": "2.3.2",
+            "har-validator": "5.0.3",
+            "hawk": "6.0.2",
+            "http-signature": "1.2.0",
+            "is-typedarray": "1.0.0",
+            "isstream": "0.1.2",
+            "json-stringify-safe": "5.0.1",
+            "mime-types": "2.1.18",
+            "oauth-sign": "0.8.2",
+            "performance-now": "2.1.0",
+            "qs": "6.5.1",
+            "safe-buffer": "5.1.1",
+            "stringstream": "0.0.5",
+            "tough-cookie": "2.3.4",
+            "tunnel-agent": "0.6.0",
+            "uuid": "3.2.1"
+          }
+        },
+        "safe-buffer": {
+          "version": "5.1.1",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.1.tgz",
+          "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg==",
+          "dev": true
+        },
+        "sntp": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/sntp/-/sntp-2.1.0.tgz",
+          "integrity": "sha512-FL1b58BDrqS3A11lJ0zEdnJ3UOKqVxawAkF3k7F0CVN7VQ34aZrV+G8BZ1WC9ZL7NyrwsW0oviwsWDgRuVYtJg==",
+          "dev": true,
+          "requires": {
+            "hoek": "4.2.1"
+          }
+        },
+        "tough-cookie": {
+          "version": "2.3.4",
+          "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+          "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+          "dev": true,
+          "requires": {
+            "punycode": "1.4.1"
+          }
+        },
+        "tunnel-agent": {
+          "version": "0.6.0",
+          "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+          "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+          "dev": true,
+          "requires": {
+            "safe-buffer": "5.1.1"
+          }
+        }
+      }
+    },
     "JSONStream": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.1.tgz",
@@ -24,7 +291,7 @@
       "integrity": "sha1-w8p0NJOGSMPg2cHjKN1otiLChMo=",
       "dev": true,
       "requires": {
-        "mime-types": "2.1.15",
+        "mime-types": "2.1.18",
         "negotiator": "0.6.1"
       }
     },
@@ -1171,6 +1438,12 @@
       "integrity": "sha1-R2iMuZu2gE8OBtPnY7HDLlfY5rY=",
       "dev": true
     },
+    "base64url": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64url/-/base64url-2.0.0.tgz",
+      "integrity": "sha1-6sFuA+oUOO/5Qj1puqNiYu0fcLs=",
+      "dev": true
+    },
     "batch": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/batch/-/batch-0.6.1.tgz",
@@ -1639,6 +1912,18 @@
       "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=",
       "dev": true
     },
+    "buffer-equal": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/buffer-equal/-/buffer-equal-1.0.0.tgz",
+      "integrity": "sha1-WWFrSYME1Var1GaWayLu2j7KX74=",
+      "dev": true
+    },
+    "buffer-equal-constant-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
+      "integrity": "sha1-+OcRMvf/5uAaXJaXpMbz5I1cyBk=",
+      "dev": true
+    },
     "buffer-shims": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/buffer-shims/-/buffer-shims-1.0.0.tgz",
@@ -2103,7 +2388,7 @@
             "is-typedarray": "1.0.0",
             "isstream": "0.1.2",
             "json-stringify-safe": "5.0.1",
-            "mime-types": "2.1.15",
+            "mime-types": "2.1.18",
             "oauth-sign": "0.8.2",
             "performance-now": "0.2.0",
             "qs": "6.4.0",
@@ -2111,7 +2396,7 @@
             "stringstream": "0.0.5",
             "tough-cookie": "2.3.2",
             "tunnel-agent": "0.6.0",
-            "uuid": "3.0.1"
+            "uuid": "3.2.1"
           }
         },
         "tunnel-agent": {
@@ -3383,6 +3668,18 @@
       "integrity": "sha1-7gHdHKwO08vH/b6jfcCo8c4ALOI=",
       "dev": true
     },
+    "duplexify": {
+      "version": "3.5.4",
+      "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-3.5.4.tgz",
+      "integrity": "sha512-JzYSLYMhoVVBe8+mbHQ4KgpvHpm0DZpJuL8PY93Vyv1fW7jYJ90LoXa1di/CVbJM+TgMs91rbDapE/RNIfnJsA==",
+      "dev": true,
+      "requires": {
+        "end-of-stream": "1.4.0",
+        "inherits": "2.0.3",
+        "readable-stream": "2.2.9",
+        "stream-shift": "1.0.0"
+      }
+    },
     "ecc-jsbn": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.1.tgz",
@@ -3393,6 +3690,16 @@
         "jsbn": "0.1.1"
       }
     },
+    "ecdsa-sig-formatter": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/ecdsa-sig-formatter/-/ecdsa-sig-formatter-1.0.9.tgz",
+      "integrity": "sha1-S8kmJ07Dtau1AW5+HWCSGsJisqE=",
+      "dev": true,
+      "requires": {
+        "base64url": "2.0.0",
+        "safe-buffer": "5.0.1"
+      }
+    },
     "ee-first": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
@@ -4451,7 +4758,7 @@
       "requires": {
         "asynckit": "0.4.0",
         "combined-stream": "1.0.5",
-        "mime-types": "2.1.15"
+        "mime-types": "2.1.18"
       }
     },
     "forwarded": {
@@ -5513,6 +5820,253 @@
         "globule": "1.2.0"
       }
     },
+    "gcp-metadata": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmjs.org/gcp-metadata/-/gcp-metadata-0.6.3.tgz",
+      "integrity": "sha512-MSmczZctbz91AxCvqp9GHBoZOSbJKAICV7Ow/AIWSJZRrRchUd5NL1b2P4OfP+4m490BEUPhhARfpHdqCxuCvg==",
+      "dev": true,
+      "requires": {
+        "axios": "0.18.0",
+        "extend": "3.0.1",
+        "retry-axios": "0.3.2"
+      },
+      "dependencies": {
+        "axios": {
+          "version": "0.18.0",
+          "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.0.tgz",
+          "integrity": "sha1-MtU+SFHv3AoRmTts0AB4nXDAUQI=",
+          "dev": true,
+          "requires": {
+            "follow-redirects": "1.4.1",
+            "is-buffer": "1.1.5"
+          }
+        },
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
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@@ -8317,6 +9081,12 @@
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@@ -10611,6 +11387,27 @@
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@@ -11208,6 +12005,213 @@
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+            "extend": "3.0.1",
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+            "har-validator": "5.0.3",
+            "hawk": "6.0.2",
+            "http-signature": "1.2.0",
+            "is-typedarray": "1.0.0",
+            "isstream": "0.1.2",
+            "json-stringify-safe": "5.0.1",
+            "mime-types": "2.1.18",
+            "oauth-sign": "0.8.2",
+            "performance-now": "2.1.0",
+            "qs": "6.5.1",
+            "safe-buffer": "5.1.1",
+            "stringstream": "0.0.5",
+            "tough-cookie": "2.3.4",
+            "tunnel-agent": "0.6.0",
+            "uuid": "3.2.1"
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+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.1.tgz",
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+          "dev": true
+        },
+        "sntp": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/sntp/-/sntp-2.1.0.tgz",
+          "integrity": "sha512-FL1b58BDrqS3A11lJ0zEdnJ3UOKqVxawAkF3k7F0CVN7VQ34aZrV+G8BZ1WC9ZL7NyrwsW0oviwsWDgRuVYtJg==",
+          "dev": true,
+          "requires": {
+            "hoek": "4.2.1"
+          }
+        },
+        "tough-cookie": {
+          "version": "2.3.4",
+          "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+          "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+          "dev": true,
+          "requires": {
+            "punycode": "1.4.1"
+          }
+        },
+        "tunnel-agent": {
+          "version": "0.6.0",
+          "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+          "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+          "dev": true,
+          "requires": {
+            "safe-buffer": "5.1.1"
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+      }
+    },
     "right-align": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/right-align/-/right-align-0.1.3.tgz",
@@ -11743,6 +12747,26 @@
       "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
       "dev": true
     },
+    "simple-git": {
+      "version": "1.92.0",
+      "resolved": "https://registry.npmjs.org/simple-git/-/simple-git-1.92.0.tgz",
+      "integrity": "sha1-YGFGjrfRnwFBB4/HQuYkV+kQ9Uc=",
+      "dev": true,
+      "requires": {
+        "debug": "3.1.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        }
+      }
+    },
     "slack-node": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/slack-node/-/slack-node-0.2.0.tgz",
@@ -11787,6 +12811,12 @@
         "nodemailer-shared": "1.1.0"
       }
     },
+    "snakeize": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/snakeize/-/snakeize-0.1.0.tgz",
+      "integrity": "sha1-EMCI2LWOsHazIpu1oE4jLOEmQi0=",
+      "dev": true
+    },
     "sntp": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/sntp/-/sntp-1.0.9.tgz",
@@ -12029,6 +13059,16 @@
         "through": "2.3.8"
       }
     },
+    "split-array-stream": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/split-array-stream/-/split-array-stream-1.0.3.tgz",
+      "integrity": "sha1-0rdajl4Ngk1S/eyLgiWDncLjXfo=",
+      "dev": true,
+      "requires": {
+        "async": "2.4.1",
+        "is-stream-ended": "0.1.4"
+      }
+    },
     "split2": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/split2/-/split2-2.2.0.tgz",
@@ -12167,6 +13207,15 @@
         }
       }
     },
+    "stream-events": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/stream-events/-/stream-events-1.0.3.tgz",
+      "integrity": "sha512-SvnBCMhEBQSJml4/ImlWkzGWgchjo1tVxnoBUOa1i1g3BsYNWz4W6a9Hc8VhqfmwJiEGu6tLrGdNRm/K/I4YXw==",
+      "dev": true,
+      "requires": {
+        "stubs": "3.0.0"
+      }
+    },
     "stream-http": {
       "version": "2.7.2",
       "resolved": "https://registry.npmjs.org/stream-http/-/stream-http-2.7.2.tgz",
@@ -12180,6 +13229,12 @@
         "xtend": "4.0.1"
       }
     },
+    "stream-shift": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/stream-shift/-/stream-shift-1.0.0.tgz",
+      "integrity": "sha1-1cdSgl5TZ+eG944Y5EXqIjoVWVI=",
+      "dev": true
+    },
     "stream-splicer": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/stream-splicer/-/stream-splicer-2.0.0.tgz",
@@ -12249,6 +13304,12 @@
       "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM=",
       "dev": true
     },
+    "string-format-obj": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string-format-obj/-/string-format-obj-1.1.1.tgz",
+      "integrity": "sha512-Mm+sROy+pHJmx0P/0Bs1uxIX6UhGJGj6xDGQZ5zh9v/SZRmLGevp+p0VJxV7lirrkAmQ2mvva/gHKpnF/pTb+Q==",
+      "dev": true
+    },
     "string-width": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.0.0.tgz",
@@ -12354,6 +13415,12 @@
       "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
       "dev": true
     },
+    "stubs": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
+      "integrity": "sha1-6NK6H6nJBXAwPAMLaQD31fiavls=",
+      "dev": true
+    },
     "style-search": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/style-search/-/style-search-0.1.0.tgz",
@@ -13380,7 +14447,7 @@
       "dev": true,
       "requires": {
         "media-typer": "0.3.0",
-        "mime-types": "2.1.15"
+        "mime-types": "2.1.18"
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     },
     "typedarray": {
@@ -13702,9 +14769,9 @@
       "dev": true
     },
     "uuid": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.0.1.tgz",
-      "integrity": "sha1-ZUS7ot/ajBzxfmKaOjBeK7H+5sE=",
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.2.1.tgz",
+      "integrity": "sha512-jZnMwlb9Iku/O3smGWvZhauCf6cvvpKi4BKRiliS3cxnI+Gz9j5MEpTz2UFuXiKPJocb7gnsLHwiS05ige5BEA==",
       "dev": true
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diff --git a/package.json b/package.json
index 53972863335..99e4539e2ea 100644
--- a/package.json
+++ b/package.json
@@ -23,6 +23,7 @@
     "test": "npm run test:unit && npm run test:closure && npm run test:dependency && npm run build && npm run clean",
     "posttest": "istanbul report --root coverage text-summary && istanbul check-coverage --lines 95 --statements 95 --branches 95 --functions 95",
     "screenshot:serve": "node test/screenshot/run-static-server.js",
+    "screenshot:upload-assets": "node test/screenshot/run-upload-assets.js",
     "screenshot:watch": "npm run clean && mkdirp test/screenshot/out/ && webpack --config=test/screenshot/webpack.config.js --watch --progress --colors",
     "start": "npm run clean && npm-run-all --parallel screenshot:serve screenshot:watch",
     "test:watch": "karma start --auto-watch",
@@ -31,6 +32,7 @@
     "test:dependency": "./scripts/dependency-test.sh"
   },
   "devDependencies": {
+    "@google-cloud/storage": "^1.6.0",
     "ascii-table": "0.0.9",
     "autoprefixer": "^8.0.0",
     "babel-core": "^6.22.1",
@@ -88,6 +90,7 @@
     "scss-parser": "^1.0.0",
     "semver": "^5.3.0",
     "serve-index": "^1.9.1",
+    "simple-git": "^1.92.0",
     "standard-changelog": "^1.0.4",
     "stylelint": "^9.0.0",
     "stylelint-config-standard": "^18.0.0",
diff --git a/test/screenshot/.eslintrc.yaml b/test/screenshot/.eslintrc.yaml
new file mode 100644
index 00000000000..12e8b813c0f
--- /dev/null
+++ b/test/screenshot/.eslintrc.yaml
@@ -0,0 +1,5 @@
+extends: ../../.eslintrc.yaml
+env:
+  browser: true
+parserOptions:
+  ecmaVersion: 2017 # Enable async/await support in Node scripts
diff --git a/test/screenshot/README.md b/test/screenshot/README.md
index ca72b09c2cc..3e43cf1490a 100644
--- a/test/screenshot/README.md
+++ b/test/screenshot/README.md
@@ -47,3 +47,15 @@ Guidelines:
 ## Example test page
 
 ![localhost_8080_mdc-button_classes_baseline html](https://user-images.githubusercontent.com/409245/38001695-05c55d10-31e3-11e8-9f35-91e3ea82f566.png)
+
+## Uploading compiled assets to Google Cloud Storage
+
+1. Start the local dev server:
+    ```bash
+    npm start
+    ```
+2. In a separate terminal, run:
+    ```bash
+    export MDC_GCLOUD_SERVICE_ACCOUNT_KEY_FILE_PATH=path/to/gcloud-service-account-key.json
+    npm run screenshot:upload-assets
+    ```
diff --git a/test/screenshot/asset-uploader.js b/test/screenshot/asset-uploader.js
new file mode 100644
index 00000000000..cdd51390b0a
--- /dev/null
+++ b/test/screenshot/asset-uploader.js
@@ -0,0 +1,131 @@
+/**
+ * Copyright 2018 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+
+const Storage = require('@google-cloud/storage');
+const glob = require('glob');
+const simpleGit = require('simple-git/promise');
+
+const USERNAME = process.env.USER || process.env.USERNAME;
+const GCLOUD_SERVICE_ACCOUNT_KEY_FILE_PATH = process.env.MDC_GCLOUD_SERVICE_ACCOUNT_KEY_FILE_PATH;
+const GCLOUD_STORAGE_BUCKET_NAME = 'mdc-web-screenshot-tests';
+const GCLOUD_STORAGE_BASE_URL = `https://storage.googleapis.com/${GCLOUD_STORAGE_BUCKET_NAME}/`;
+const LOCAL_DIRECTORY_PREFIX = 'test/screenshot/';
+
+const gitRepo = simpleGit();
+const storage = new Storage({
+  credentials: require(GCLOUD_SERVICE_ACCOUNT_KEY_FILE_PATH),
+});
+const bucket = storage.bucket(GCLOUD_STORAGE_BUCKET_NAME);
+
+async function upload() {
+  const promises = [];
+
+  // Attaching Git metadata to the uploaded files makes it easier to track down their source.
+  const gitCommitShort = await git('revparse', ['--short', 'HEAD']);
+  const gitBranchName = await git('revparse', ['--abbrev-ref', 'HEAD']);
+
+  // Every batch of files gets uploaded to a unique timestamped directory to prevent collisions between developers.
+  const {year, month, day, hour, minute, second, ms} = getUtcDateTime();
+  const baseGcsDir = `${USERNAME}/${year}/${month}/${day}/${hour}_${minute}_${second}_${ms}/${gitCommitShort}/assets/`;
+  const relativeLocalFilePaths = glob.sync(path.join(LOCAL_DIRECTORY_PREFIX, '**/*')).filter(isFile);
+
+  relativeLocalFilePaths.forEach((relativeLocalFilePath) => {
+    const fileContents = fs.readFileSync(relativeLocalFilePath);
+    const relativeGcsFilePath = relativeLocalFilePath.replace(LOCAL_DIRECTORY_PREFIX, '');
+    const absoluteGcsFilePath = `${baseGcsDir}${relativeGcsFilePath}`;
+
+    console.log(`➡️ Uploading ${absoluteGcsFilePath} ...`);
+
+    const file = bucket.file(absoluteGcsFilePath);
+
+    // Note: The GCS API mutates this object, so we need to create a new object every time we call the API.
+    const fileOptions = {
+      contentType: 'auto',
+
+      // The nested `metadata` object is not a typo - it's required by the GCS `File#save()` API.
+      metadata: {
+        metadata: {
+          'X-MDC-Git-Commit': gitCommitShort,
+          'X-MDC-Git-Branch': gitBranchName,
+        },
+      },
+    };
+
+    promises.push(
+      file.save(fileContents, fileOptions)
+        .then(() => handleUploadSuccess(baseGcsDir, relativeGcsFilePath))
+        .catch((err) => handleUploadFailure(baseGcsDir, relativeGcsFilePath, err))
+    );
+  });
+
+  return Promise.all(promises);
+}
+
+function getUtcDateTime() {
+  const pad = (num) => String(num).padStart(2, '0');
+  const date = new Date();
+
+  return {
+    year: date.getUTCFullYear(),
+    month: pad(date.getUTCMonth() + 1), // getUTCMonth() returns a zero-based value (e.g., January is `0`)
+    day: pad(date.getUTCDate()),
+    hour: pad(date.getUTCHours()),
+    minute: pad(date.getUTCMinutes()),
+    second: pad(date.getUTCSeconds()),
+    ms: pad(date.getUTCMilliseconds()),
+  };
+}
+
+function handleUploadSuccess(baseGcsDir, relativeGcsFilePath) {
+  console.log(`✔︎ Uploaded ${GCLOUD_STORAGE_BASE_URL}${baseGcsDir}${relativeGcsFilePath}`);
+  return {
+    status: 'SUCCESS',
+    error: null,
+    bucketUrl: GCLOUD_STORAGE_BASE_URL,
+    parentDir: baseGcsDir,
+    relativePath: relativeGcsFilePath,
+    fullUrl: `${GCLOUD_STORAGE_BASE_URL}${baseGcsDir}${relativeGcsFilePath}`,
+  };
+}
+
+function handleUploadFailure(baseGcsDir, relativeGcsFilePath, err) {
+  console.error(`✗︎ FAILED to upload ${GCLOUD_STORAGE_BASE_URL}${baseGcsDir}${relativeGcsFilePath}:\n`, err);
+  return {
+    status: 'ERROR',
+    error: err,
+    bucketUrl: GCLOUD_STORAGE_BASE_URL,
+    parentDir: baseGcsDir,
+    relativePath: relativeGcsFilePath,
+    fullUrl: `${GCLOUD_STORAGE_BASE_URL}${baseGcsDir}${relativeGcsFilePath}`,
+  };
+}
+
+function isFile(path) {
+  return fs.statSync(path).isFile();
+}
+
+async function git(cmd, argList = []) {
+  return (await gitRepo[cmd](argList) || '').trim();
+}
+
+module.exports = {
+  upload,
+};
diff --git a/test/screenshot/run-upload-assets.js b/test/screenshot/run-upload-assets.js
new file mode 100644
index 00000000000..a87b54ddb0a
--- /dev/null
+++ b/test/screenshot/run-upload-assets.js
@@ -0,0 +1,34 @@
+/**
+ * Copyright 2018 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+'use strict';
+
+const assetUploader = require('./asset-uploader');
+
+assetUploader.upload()
+  .then((files) => {
+    const htmlFileUrls =
+      files
+        .filter((file) => file.relativePath.endsWith('.html'))
+        .map((file) => file.fullUrl)
+        .sort();
+    console.log('\n\nDONE!\n\n');
+    console.log(htmlFileUrls.join('\n'));
+  })
+  .catch((err) => {
+    console.error('\n\nERROR!\n\n');
+    console.error(err);
+  });