ash: Separate out SystemTrayBubble and related classes into a new file.

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,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
 
@@ skipping 122 matching lines @@
         'system/network/tray_network.h',
         'system/power/power_status_observer.h',
         'system/power/power_supply_status.cc',
         'system/power/power_supply_status.h',
         'system/power/tray_power.cc',
         'system/power/tray_power.h',
         'system/settings/tray_settings.cc',
         'system/settings/tray_settings.h',
         'system/tray/system_tray.cc',
         'system/tray/system_tray.h',
+        'system/tray/system_tray_bubble.cc',
+        'system/tray/system_tray_bubble.h',
         'system/tray/system_tray_delegate.cc',
         'system/tray/system_tray_delegate.h',
         'system/tray/system_tray_item.cc',
         'system/tray/system_tray_item.h',
         'system/tray/system_tray_widget_delegate.cc',
         'system/tray/system_tray_widget_delegate.h',
         'system/tray/tray_constants.cc',
         'system/tray/tray_constants.h',
         'system/tray/tray_empty.cc',
         'system/tray/tray_empty.h',
@@ skipping 365 matching lines @@
             'shell/cocoa/app-Info.plist',
           ],
           'xcode_settings': {
             'INFOPLIST_FILE': 'shell/cocoa/app-Info.plist',
           },
         }],
       ],
     },
   ],
 }