[GPU] Get GPU process running on the mac...

build/common.gypi

 # Copyright (c) 2009 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': {
     # .gyp files should set chromium_code to 1 if they build Chromium-specific
@@ skipping 262 matching lines @@
           },{
             'msvs_large_module_debug_link_mode%': '2',  # Yes
           }],
         ],
         'nacl_win64_defines': [
           # This flag is used to minimize dependencies when building
           # Native Client loader for 64-bit Windows.
           'NACL_WIN64',
         ],
       }],
+      # Compute based on OS and target architecture whether the GPU
+      # plugin / process is supported.
+      [ 'OS=="win" or (OS=="linux" and target_arch!="arm") or OS=="mac"', {
+        # Enable a variable used elsewhere throughout the GYP files to determine
+        # whether to compile in the sources for the GPU plugin / process.
+        'enable_gpu%': 1,
+      }, {  # GPU plugin not supported
+        'enable_gpu%': 0,
+      }],
     ],
 
     # NOTE: When these end up in the Mac bundle, we need to replace '-' for '_'
     # so Cocoa is happy (http://crbug.com/20441).
     'locales': [
       'am', 'ar', 'bg', 'bn', 'ca', 'cs', 'da', 'de', 'el', 'en-GB',
       'en-US', 'es-419', 'es', 'et', 'fi', 'fil', 'fr', 'gu', 'he',
       'hi', 'hr', 'hu', 'id', 'it', 'ja', 'kn', 'ko', 'lt', 'lv',
       'ml', 'mr', 'nb', 'nl', 'or', 'pl', 'pt-BR', 'pt-PT', 'ro',
       'ru', 'sk', 'sl', 'sr', 'sv', 'sw', 'ta', 'te', 'th', 'tr',
@@ skipping 46 matching lines @@
       ['selinux==1', {
         'defines': ['CHROMIUM_SELINUX=1'],
       }],
       ['win_use_allocator_shim==0', {
         'conditions': [
           ['OS=="win"', {
             'defines': ['NO_TCMALLOC'],
           }],
         ],
       }],
-      ['OS=="win" or (OS=="linux" and target_arch!="arm")', {
+      ['enable_gpu==1', {
         'defines': [
           'ENABLE_GPU=1',
         ],
       }],
       ['coverage!=0', {
         'conditions': [
           ['OS=="mac"', {
             'xcode_settings': {
               'GCC_INSTRUMENT_PROGRAM_FLOW_ARCS': 'YES',  # -fprofile-arcs
               'GCC_GENERATE_TEST_COVERAGE_FILES': 'YES',  # -ftest-coverage
@@ skipping 800 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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