Fix scrollbar buttons at hidpi when enable-use-zoom-for-dsf is on.

ui/native_theme/native_theme.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': [
     {
@@ skipping 40 matching lines @@
       ],
     },
     {
       'target_name': 'native_theme_unittests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:test_support_base',
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
+        '../gfx/gfx.gyp:gfx_geometry',
         'native_theme',
       ],
       'sources': [
         '../../base/test/run_all_unittests.cc',
+        'native_theme_aura_unittest.cc',
         'native_theme_mac_unittest.cc',
       ],
     },
   ],
 }