Enables hot-tracking for overflow extension buttons in the app menu

ash/ash.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,
     # These files lists are shared with the GN build.
     'ash_sources': [
       'accelerators/accelerator_commands.cc',
@@ skipping 962 matching lines @@
         '../ui/events/devices/events_devices.gyp:events_devices',
         '../ui/events/events.gyp:events',
         '../ui/events/events.gyp:events_base',
         '../ui/events/events.gyp:gesture_detection',
         '../ui/events/platform/events_platform.gyp:events_platform',
         '../ui/gfx/gfx.gyp:gfx',
         '../ui/gfx/gfx.gyp:gfx_geometry',
         '../ui/gfx/gfx.gyp:gfx_vector_icons',
         '../ui/keyboard/keyboard.gyp:keyboard',
         '../ui/message_center/message_center.gyp:message_center',
+        '../ui/native_theme/native_theme.gyp:native_theme',
         '../ui/platform_window/stub/stub_window.gyp:stub_window',
         '../ui/resources/ui_resources.gyp:ui_resources',
         '../ui/strings/ui_strings.gyp:ui_strings',
         '../ui/views/views.gyp:views',
         '../ui/wm/wm.gyp:wm',
         '../url/url.gyp:url_lib',
         'ash_resources.gyp:ash_resources',
         'ash_strings.gyp:ash_strings',
       ],
       'defines': [
@@ skipping 362 matching lines @@
                   '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }