Pass initial size and GPU preference via context attributes

gpu/command_buffer/command_buffer.gyp

 # 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': {
     'chromium_code': 1,
   },
   'includes': [
     'command_buffer.gypi',
   ],
   'targets': [
     {
       'target_name': 'gles2_utils',
       'type': '<(component)',
       'variables': {
         'gles2_utils_target': 1,
       },
       'dependencies': [
         '../../base/base.gyp:base',
+        '../../ui/gfx/gfx.gyp:gfx_geometry',
         '../../third_party/khronos/khronos.gyp:khronos_headers',
       ],
       'export_dependent_settings': [
         '../../base/base.gyp:base',
       ],
     },
   ],
 }