WIP: Eliminate event.target() usage from TrayEventFilter

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 31 matching lines @@
       'ash_touch_exploration_manager_chromeos.cc',
       'ash_touch_exploration_manager_chromeos.h',
       'audio/sounds.cc',
       'audio/sounds.h',
       'autoclick/autoclick_controller.cc',
       'autoclick/autoclick_controller.h',
       'cancel_mode.cc',
       'cancel_mode.h',
       'cast_config_delegate.cc',
       'cast_config_delegate.h',
+      'container_delegate.h',
+      'container_delegate_aura.cc',
+      'container_delegate_aura.h',
       'debug.cc',
       'debug.h',
       'default_accessibility_delegate.cc',
       'default_accessibility_delegate.h',
       'default_user_wallpaper_delegate.cc',
       'default_user_wallpaper_delegate.h',
       'desktop_background/desktop_background_controller.cc',
       'desktop_background/desktop_background_controller.h',
       'desktop_background/desktop_background_controller_observer.h',
       'desktop_background/desktop_background_view.cc',
@@ skipping 1284 matching lines @@
                   '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }