Install CIPD ninja using DEPS

Author: Jwata

.gitignore

@@ -29,6 +29,7 @@ docs/doxygen/
 xcuserdata
 
 third_party/gn/
+third_party/ninja/ninja*
 
 # Miscellaneous
 *.class

DEPS

@@ -616,6 +616,15 @@ deps = {
     ],
     'dep_type': 'cipd',
   },
+  'src/flutter/third_party/ninja': {
+    'packages': [
+      {
+        'package': 'infra/3pp/tools/ninja/${{platform}}',
+        'version': 'version:2@1.8.2.chromium.3',
+      }
+    ],
+    'dep_type': 'cipd',
+  },
 
   'src/buildtools/emsdk': {
    'url': Var('skia_git') + '/external/github.com/emscripten-core/emsdk.git' + '@' + 'fc645b7626ebf86530dbd82fbece74d457e7ae07',

third_party/ninja/README.flutter

@@ -0,0 +1,17 @@
+Name: ninja
+Short Name: ninja
+URL: https://github.com/ninja-build/ninja
+Revision: See the CIPD version in DEPS
+License: Apache License 2.0
+License File: https://github.com/ninja-build/ninja/blob/master/COPYING
+Security Critical: no
+
+Description:
+Ninja is a small build system with a focus on speed, and is used to build
+this project.
+
+The CIPD packages are built using the 3pp pipeline.
+https://chromium.googlesource.com/infra/infra/+/refs/heads/main/3pp/ninja/
+
+Local Modifications:
+None