Retry 3 to split WebGraphicsContext3DCommandBufferImpl::initialize() into two stages.

build/common.gypi

 # Copyright (c) 2011 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 159 matching lines @@
       # Set to select the Title Case versions of strings in GRD files.
       'use_titlecase_in_grd_files%': 0,
 
       # Use translations provided by volunteers at launchpad.net.  This
       # currently only works on Linux.
       'use_third_party_translations%': 0,
 
       # Remoting compilation is enabled by default. Set to 0 to disable.
       'remoting%': 1,
 
+      # Threaded compositing
+      'use_threaded_compositing%': 0,
+
       # P2P APIs are compiled in by default. Set to 0 to disable.
       # Also note that this should be enabled for remoting to compile.
       'p2p_apis%': 1,
 
       # Configuration policy is enabled by default. Set to 0 to disable.
       'configuration_policy%': 1,
 
       # Safe browsing is compiled in by default. Set to 0 to disable.
       'safe_browsing%': 1,
 
@@ skipping 122 matching lines @@
     'fastbuild%': '<(fastbuild)',
     'python_ver%': '<(python_ver)',
     'armv7%': '<(armv7)',
     'arm_neon%': '<(arm_neon)',
     'sysroot%': '<(sysroot)',
     'disable_sse2%': '<(disable_sse2)',
     'component%': '<(component)',
     'use_titlecase_in_grd_files%': '<(use_titlecase_in_grd_files)',
     'use_third_party_translations%': '<(use_third_party_translations)',
     'remoting%': '<(remoting)',
+    'use_threaded_compositing%': '<(use_threaded_compositing)',
     'enable_webrtc%': '<(enable_webrtc)',
     'p2p_apis%': '<(p2p_apis)',
     'configuration_policy%': '<(configuration_policy)',
     'safe_browsing%': '<(safe_browsing)',
     'clang_use_chrome_plugins%': '<(clang_use_chrome_plugins)',
     'asan%': '<(asan)',
     'enable_register_protocol_handler%': '<(enable_register_protocol_handler)',
     'enable_smooth_scrolling%': '<(enable_smooth_scrolling)',
     'enable_web_intents%': '<(enable_web_intents)',
     # Whether to build for Wayland display server
@@ skipping 481 matching lines @@
         'defines': ['ENABLE_PROFILING=1'],
       }],
       ['OS=="linux" and glibcxx_debug==1', {
         'defines': ['_GLIBCXX_DEBUG=1',],
         'cflags_cc!': ['-fno-rtti'],
         'cflags_cc+': ['-frtti', '-g'],
       }],
       ['remoting==1', {
         'defines': ['ENABLE_REMOTING=1'],
       }],
+      ['use_threaded_compositing==1', {
+        'defines': ['WTF_USE_THREADED_COMPOSITING'],
+      }],
       ['p2p_apis==1', {
         'defines': ['ENABLE_P2P_APIS=1'],
       }],
       ['proprietary_codecs==1', {
         'defines': ['USE_PROPRIETARY_CODECS'],
       }],
       ['enable_flapper_hacks==1', {
         'defines': ['ENABLE_FLAPPER_HACKS=1'],
       }],
       ['configuration_policy==1', {
         'defines': ['ENABLE_CONFIGURATION_POLICY'],
       }],
       ['fastbuild!=0', {
+
         'conditions': [
           # For Windows, we don't genererate debug information.
           ['OS=="win"', {
             'msvs_settings': {
               'VCLinkerTool': {
                 'GenerateDebugInformation': 'false',
               },
               'VCCLCompilerTool': {
                 'DebugInformationFormat': '0',
               }
@@ skipping 1206 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }