ozone: Create a separate small gfx_ozone target.

ui/gfx/gfx.gyp

 # Copyright (c) 2013 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': [
     {
@@ skipping 185 matching lines @@
         'image/image_util_ios.mm',
         'interpolated_transform.cc',
         'interpolated_transform.h',
         'linux_font_delegate.cc',
         'linux_font_delegate.h',
         'mac/scoped_ns_disable_screen_updates.h',
         'native_widget_types.h',
         'nine_image_painter.cc',
         'nine_image_painter.h',
         'overlay_transform.h',
-        'ozone/impl/file_surface_factory.cc',
-        'ozone/impl/file_surface_factory.h',
-        'ozone/surface_factory_ozone.cc',
-        'ozone/surface_factory_ozone.h',
-        'ozone/surface_ozone_egl.h',
-        'ozone/surface_ozone_canvas.h',
-        'ozone/overlay_candidates_ozone.cc',
-        'ozone/overlay_candidates_ozone.h',
         'pango_util.cc',
         'pango_util.h',
         'path.cc',
         'path.h',
         'path_aura.cc',
         'path_win.cc',
         'path_win.h',
         'path_x11.cc',
         'path_x11.h',
         'platform_font.h',
@@ skipping 362 matching lines @@
             'x/x11_error_tracker.cc',
             'x/x11_error_tracker.h',
             'x/x11_types.cc',
             'x/x11_types.h',
           ],
         },
       ]
     }],
   ],
 }