Add a go-fast button to Skia GYP configs.

gyp/common_conditions.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
+
 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
     'SK_SUPPORT_GPU=<(skia_gpu)',
     'SK_SUPPORT_OPENCL=<(skia_opencl)',
     'SK_FORCE_DISTANCE_FIELD_TEXT=<(skia_force_distance_field_text)',
   ],
   'conditions' : [
@@ skipping 207 matching lines @@
 
           '-Wno-unused-parameter',
         ],
         'cflags_cc': [
           '-std=c++11',
           '-fno-rtti',
           '-Wnon-virtual-dtor',
           '-Wno-invalid-offsetof',  # GCC <4.6 is old-school strict about what is POD.
         ],
         'conditions': [
+          [ 'skia_fast', { 'cflags': [ '<@(skia_fast_flags)' ] }],
           [ 'skia_os != "chromeos"', {
             'conditions': [
               [ 'skia_arch_type == "x86_64" and not skia_android_framework', {
                 'cflags': [
                   '-m64',
                 ],
                 'ldflags': [
                   '-m64',
                 ],
               }],
@@ skipping 280 matching lines @@
           'Debug': {
             'xcode_settings': { 'GCC_OPTIMIZATION_LEVEL': '0' },
           },
           'Release': {
             'xcode_settings': { 'GCC_OPTIMIZATION_LEVEL': '<(skia_release_optimization_level)', },
             'defines': [ 'NDEBUG' ],
           },
         },
         'xcode_settings': {
           'conditions': [
+            [ 'skia_fast', { 'WARNING_CFLAGS': [ '<@(skia_fast_flags)' ] } ],
             [ 'skia_warnings_as_errors', { 'GCC_TREAT_WARNINGS_AS_ERRORS': 'YES' }],
             [ 'skia_arch_width == 32', { 'ARCHS': ['i386']   }],
             [ 'skia_arch_width == 64', { 'ARCHS': ['x86_64'] }],
             [ 'skia_osx_deployment_target==""', {
               'MACOSX_DEPLOYMENT_TARGET': '10.6', # -mmacos-version-min, passed in env to ld.
             }, {
               'MACOSX_DEPLOYMENT_TARGET': '<(skia_osx_deployment_target)',
             }],
           ],
           'CLANG_CXX_LANGUAGE_STANDARD':               'c++11',
@@ skipping 120 matching lines @@
         # add flags here (e.g. SK_SUPPORT_LEGACY_...) needed by moz2d
       ],
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }