Add support for multi resolution icons

ui/ui_unittests.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'ui_unittests',
       'type': 'executable',
       'msvs_guid': 'C412B00F-2098-4833-B3DE-A1B8B7A094F0',
@@ skipping 16 matching lines @@
         'base/gtk/gtk_im_context_util_unittest.cc',
         'base/range/range_unittest.cc',
         'base/range/range_unittest.mm',
         'gfx/blit_unittest.cc',
         'gfx/codec/jpeg_codec_unittest.cc',
         'gfx/codec/png_codec_unittest.cc',
         'gfx/color_utils_unittest.cc',
         'gfx/font_unittest.cc',
         'gfx/image_unittest.cc',
         'gfx/image_unittest.h',
+        'gfx/image_mac_unittest.mm',
         'gfx/insets_unittest.cc',
         'gfx/rect_unittest.cc',
         'gfx/run_all_unittests.cc',
         'gfx/skbitmap_operations_unittest.cc',
         'gfx/test_suite.cc',
         'gfx/test_suite.h',
         'views/rendering/border_unittest.cc',
         'views/view_unittest.cc',
         'views/widget/native_widget_win_unittest.cc',
         'views/widget/root_view_unittest.cc',
@@ skipping 58 matching lines @@
       ],
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: