tests: run ToT and stable Chrome for smoke tests in github workflow

.github/workflows/ci.yml

@@ -37,6 +37,13 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install protobuf==3.7.1
+
+    # Chrome Stable is already installed by default.
+    - name: Install Chrome ToT
+      run: bash lighthouse-core/scripts/download-chrome.sh
+      env:
+        CHROME_PATH: /home/runner/chrome-tot
+    - run: mv chrome-linux /home/runner/chrome-linux-tot
 
     # Cache yarn deps. thx https://github.com/actions/cache/blob/master/examples.md#node---yarn
     - name: Get yarn cache directory path
@@ -62,10 +69,17 @@ jobs:
     - run: sudo apt-get install xvfb
     - run: xvfb-run --auto-servernum yarn unit
     - run: xvfb-run --auto-servernum yarn test-clients
-    - run: xvfb-run --auto-servernum yarn smoke --debug -j=1 --retries=2
     - run: xvfb-run --auto-servernum yarn test-bundle
     - run: xvfb-run --auto-servernum yarn test-docs
 
+    - name: Smoke (ToT)
+      run: xvfb-run --auto-servernum yarn smoke --debug -j=1 --retries=2
+      env:
+        CHROME_PATH: /home/runner/chrome-linux-tot/chrome
+    - name: Smoke (stable)
+      run: xvfb-run --auto-servernum yarn smoke --debug -j=1 --retries=2
+
+
     - run: yarn test-lantern
     - run: yarn test-legacy-javascript
     - run: yarn i18n:checks

lighthouse-core/scripts/download-chrome-canary.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+##
+# @license Copyright 2017 The Lighthouse Authors. 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.
+##
+
+wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
+sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
+sudo apt-get update
+sudo apt-get install -y google-chrome-canary --no-install-recommends # Not a thing lol.
+sudo apt-get clean

lighthouse-core/scripts/download-chrome.sh

@@ -8,6 +8,8 @@
 
 # Download chrome inside of our CI env.
 
+echo "CHROME_PATH $CHROME_PATH"
+
 if [ "$APPVEYOR" == "True" ]; then
   url="https://download-chromium.appspot.com/dl/Win?type=snapshots"
 else