Brotli compression used on about credits html file.

components/components_resources.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'about_credits_file': '<(SHARED_INTERMEDIATE_DIR)/about_credits.html',
+    'about_credits_file_bro': '<(SHARED_INTERMEDIATE_DIR)/about_credits.bro',
   },
   'targets': [
     {
       # GN version: //components/resources
       'target_name': 'components_resources',
       'type': 'none',
       'dependencies': [
-        'about_credits',
+        'compressed_about_credits',
       ],
       'hard_dependency': 1,
       'variables': {
         'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/components',
       },
       'actions': [
         {
           # GN version: //components/resources:components_resources
           'action_name': 'generate_components_resources',
           'variables': {
             'grit_grd_file': 'resources/components_resources.grd',
             'grit_additional_defines': [
-              '-E', 'about_credits_file=<(about_credits_file)',
+              '-E', 'about_credits_file=<(about_credits_file_bro)',
             ],
           },
           'includes': [ '../build/grit_action.gypi' ],
         },
         {
           # GN version: //components/resources:components_scaled_resources
           'action_name': 'generate_components_scaled_resources',
           'variables': {
             'grit_grd_file': 'resources/components_scaled_resources.grd',
           },
           'includes': [ '../build/grit_action.gypi' ],
         },
       ],
       'includes': [ '../build/grit_target.gypi' ],
     },
     {
+      'target_name': 'compressed_about_credits',
+      'type': 'none',
+      'actions': [
+        {
+          'variables': {
+            'input_file': '<(about_credits_file)',
+            'output_file': '<(about_credits_file_bro)',
+          },
+          'includes': ['../third_party/brotli/bro.gypi'],
+        }
+      ],
+      'dependencies': [
+        'about_credits'
+      ],
+    },
+    {
       # GN version: //components/resources:about_credits
       'target_name': 'about_credits',
       'type': 'none',
       'hard_dependency': 1,
       'actions': [
         {
           'variables': {
             'generator_path': '../tools/licenses.py',
           },
           'action_name': 'generate_about_credits',
@@ skipping 12 matching lines @@
                      '--target-os=<(OS)',
                      'credits',
                      '<(about_credits_file)',
           ],
           'message': 'Generating about:credits',
         },
       ],
     },
   ],
 }