Implement the Platform::sharedOffscreenGraphicsContext3D method.

webkit/tools/test_shell/test_shell.gypi

 # Copyright (c) 2012 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': {
     'test_shell_windows_resource_files': [
       'resources/test_shell.rc',
       '../../glue/resources/pan_east.cur',
       '../../glue/resources/pan_middle.cur',
@@ skipping 49 matching lines @@
             '<(DEPTH)/gpu/gpu.gyp:gles2_c_lib',
             '<(DEPTH)/media/media.gyp:media',
             '<(DEPTH)/net/net.gyp:net',
             '<(DEPTH)/skia/skia.gyp:skia',
             '<(DEPTH)/testing/gmock.gyp:gmock',
             '<(DEPTH)/testing/gtest.gyp:gtest',
             '<(DEPTH)/third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:inspector_resources',
             '<(DEPTH)/third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
             '<(DEPTH)/ui/native_theme/native_theme.gyp:native_theme',
             '<(DEPTH)/v8/tools/gyp/v8.gyp:v8',
+            '<(DEPTH)/webkit/gpu/webkit_gpu.gyp:webkit_gpu',
             '<(DEPTH)/webkit/support/webkit_support.gyp:glue',
             '<(DEPTH)/webkit/support/webkit_support.gyp:user_agent',
             '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_base',
-            '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_gpu',
             '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_media',
             '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_resources',
             '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_storage',
             '<(DEPTH)/webkit/support/webkit_support.gyp:webkit_support_common',
           ],
           'sources': [
             'mac/test_shell_webview.h',
             'mac/test_shell_webview.mm',
             'accessibility_ui_element.cc',
             'accessibility_ui_element.h',
@@ skipping 553 matching lines @@
               'action_name': 'test_shell_resources',
               'includes': [ '../../../build/grit_action.gypi' ],
             },
           ],
           'includes': [ '../../../build/grit_target.gypi' ],
         },
       ],
     }],
   ],
 }