[ash-md] Animates overview shield in and out

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 337 matching lines @@
       'common/wm/maximize_mode/maximize_mode_event_handler.h',
       'common/wm/maximize_mode/maximize_mode_window_manager.cc',
       'common/wm/maximize_mode/maximize_mode_window_manager.h',
       'common/wm/maximize_mode/maximize_mode_window_state.cc',
       'common/wm/maximize_mode/maximize_mode_window_state.h',
       'common/wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard.h',
       'common/wm/maximize_mode/workspace_backdrop_delegate.cc',
       'common/wm/maximize_mode/workspace_backdrop_delegate.h',
       'common/wm/mru_window_tracker.cc',
       'common/wm/mru_window_tracker.h',
+      'common/wm/overview/cleanup_animation_observer.cc',
+      'common/wm/overview/cleanup_animation_observer.h',
       'common/wm/overview/overview_animation_type.h',
       'common/wm/overview/scoped_overview_animation_settings.h',
       'common/wm/overview/scoped_overview_animation_settings_factory.cc',
       'common/wm/overview/scoped_overview_animation_settings_factory.h',
       'common/wm/overview/scoped_transform_overview_window.cc',
       'common/wm/overview/scoped_transform_overview_window.h',
       'common/wm/overview/window_grid.cc',
       'common/wm/overview/window_grid.h',
       'common/wm/overview/window_selector.cc',
       'common/wm/overview/window_selector.h',
@@ skipping 536 matching lines @@
       'common/system/chromeos/screen_security/screen_tray_item_unittest.cc',
       'common/system/chromeos/session/logout_confirmation_controller_unittest.cc',
       'common/system/chromeos/session/tray_session_length_limit_unittest.cc',
       'common/system/chromeos/supervised/tray_supervised_user_unittest.cc',
       'common/system/date/date_view_unittest.cc',
       'common/system/ime/tray_ime_chromeos_unittest.cc',
       'common/system/tray/system_tray_unittest.cc',
       'common/system/tray/tray_details_view_unittest.cc',
       'common/system/update/tray_update_unittest.cc',
       'common/system/user/tray_user_unittest.cc',
+      'common/wm/overview/cleanup_animation_observer_unittest.cc',
       'content/display/screen_orientation_controller_chromeos_unittest.cc',
       'content/keyboard_overlay/keyboard_overlay_delegate_unittest.cc',
       'content/keyboard_overlay/keyboard_overlay_view_unittest.cc',
       'desktop_background/desktop_background_controller_unittest.cc',
       'dip_unittest.cc',
       'display/cursor_window_controller_unittest.cc',
       'display/display_change_observer_chromeos_unittest.cc',
       'display/display_color_manager_chromeos_unittest.cc',
       'display/display_error_observer_chromeos_unittest.cc',
       'display/display_manager_unittest.cc',
@@ skipping 524 matching lines @@
                   '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }