Chrobalt build acceleration.

Set up Chrobalt build acceleration with RBE making it the default
accelerator for both developers and the CI system.

b/384982606

.github/actions/build/action.yaml

@@ -10,30 +10,30 @@ runs:
       - name: Get depot tools
         run: git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
         shell: bash
-      - name: Add directory to PATH
+      - name: Add depot tools to PATH
         run: echo "$GITHUB_WORKSPACE/depot_tools" >> $GITHUB_PATH
         shell: bash
+      - name: Disable Chromium client side build telemetry
+        run: build_telemetry opt-out
+        shell: bash
       - name: Generate gclient file
-        run: gclient config --name=src https://github.com/${{ github.repository }}
+        run: gclient config --name=src https://github.com/${{ github.repository }} --custom-var=download_remoteexec_cfg=True
         shell: bash
       - name: Set target OS for Android
         if: ${{ contains(matrix.platform, 'android') }}
         run: |
           echo "target_os=['android']" >> .gclient
           gclient validate
         shell: bash
-      - name: Gclient sync
+      - name: gclient sync
         run: gclient sync -v --shallow --no-history -r ${{ github.sha }}
         shell: bash
-      - name: sccache check
-        run: sccache -s
-        shell: bash
-      - name: gn gen
+      - name: GN gen
         run: |
           cd src
           cobalt/build/gn.py -p ${{ matrix.platform }} -C ${{ matrix.config }}
         shell: bash
-      - name: Dump GN args
+      - name: List GN args
         run: |
           cd src
           gn args --list --short --overrides-only out/${{ matrix.platform }}_${{ matrix.config }}
@@ -44,10 +44,7 @@ runs:
         run: |
           set -x
           cd src
-          ninja -C out/${{ matrix.platform }}_${{ matrix.config }} $(echo "${TARGETS}" | tr -d '"')
-        shell: bash
-      - name: Dump sccache stats
-        run: sccache -s
+          time autoninja -C out/${{ matrix.platform }}_${{ matrix.config }} $(echo "${TARGETS}" | tr -d '"')
         shell: bash
       - name: Archive Android APKs
         if: startsWith(matrix.platform, 'android') && matrix.config == 'qa'

DEPS

@@ -261,7 +261,7 @@ vars = {
   # Fetch configuration files required for the 'use_remoteexec' gn arg
   'download_remoteexec_cfg': False,
   # RBE instance to use for running remote builds
-  'rbe_instance': Str('projects/rbe-chrome-untrusted/instances/default_instance'),
+  'rbe_instance': Str('projects/cobalt-actions-devel/instances/default_instance'),
   # RBE project to download rewrapper config files for. Only needed if
   # different from the project used in 'rbe_instance'
   'rewrapper_cfg_project': Str(''),

buildtools/reclient_cfgs/fetch_reclient_cfgs.py

@@ -48,14 +48,17 @@ class CipdError(Exception):
 def CipdEnsure(pkg_name, ref, directory, quiet):
     logging.info('ensure %s %s in %s' % (pkg_name, ref, directory))
     log_level = 'warning' if quiet else 'debug'
+    auth = []
+    if os.getenv('IS_CI', default='0') == '1':
+        auth = ['-service-account-json', ':gce']
     ensure_file = """
 $ParanoidMode CheckPresence
 {pkg} {ref}
 """.format(pkg=pkg_name, ref=ref)
     try:
       output = subprocess.check_output(
           ' '.join(['cipd', 'ensure', '-log-level=' + log_level,
-                    '-root', directory, '-ensure-file', '-']),
+                    '-root', directory, '-ensure-file', '-'] + auth),
           shell=True, input=ensure_file, stderr=subprocess.STDOUT,
           universal_newlines=True)
       logging.info(output)

cobalt/build/gn.py

@@ -86,7 +86,7 @@ def write_build_args(build_args_path, original_lines, dict_settings,
         f'The following args cannot be set in configs: {controlled_args}')
   gen_comment = '# Set by gn.py'
   with open(build_args_path, 'w', encoding='utf-8') as f:
-    if os.getenv('IS_CI', default='0') == '1':
+    if os.getenv('USE_CC_WRAPPER', default='0') == '1':
       f.write(f'cc_wrapper = "{CC_WRAPPER}" {gen_comment}\n')
     else:
       f.write(f'use_remoteexec = true {gen_comment}\n')