gfx: Create a separate gfx component out of ui.

ui/oak/oak.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,
   },
 
   'targets': [
     {
       'target_name': 'oak',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
         '../../skia/skia.gyp:skia',
         '../../url/url.gyp:url_lib',
         '../aura/aura.gyp:aura',
         '../compositor/compositor.gyp:compositor',
+        '../gfx/gfx.gyp:gfx',
         '../ui.gyp:ui',
         '../ui.gyp:ui_resources',
         '../views/views.gyp:views',
       ],
       'defines': [
         'OAK_IMPLEMENTATION',
       ],
       'sources': [
         # All .cc, .h under oak, except unittests
         'oak.h',
         'oak_aura_window_display.cc',
         'oak_aura_window_display.h',
         'oak_export.h',
         'oak_pretty_print.cc',
         'oak_pretty_print.h',
         'oak_tree_model.cc',
         'oak_tree_model.h',
         'oak_window.cc',
         'oak_window.h',
         'oak_details_model.h',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }