Implemented screen rotation animation experiment.

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 149 matching lines @@
       'multi_profile_uma.cc',
       'multi_profile_uma.h',
       'networking_config_delegate.cc',
       'networking_config_delegate.h',
       'popup_message.cc',
       'popup_message.h',
       'root_window_controller.cc',
       'root_window_controller.h',
       'root_window_settings.cc',
       'root_window_settings.h',
-      'rotator/screen_rotation.cc',
-      'rotator/screen_rotation.h',
+      'rotator/screen_rotation_animation.cc',
+      'rotator/screen_rotation_animation.h',
+      'rotator/screen_rotation_animator.cc',
+      'rotator/screen_rotation_animator.h',
+      'rotator/window_rotation.cc',
+      'rotator/window_rotation.h',
       'scoped_target_root_window.cc',
       'scoped_target_root_window.h',
       'screen_util.cc',
       'screen_util.h',
       'screenshot_delegate.h',
       'session/session_state_delegate.cc',
       'session/session_state_delegate.h',
       'session/session_state_observer.cc',
       'session/session_state_observer.h',
       'shelf/app_list_button.cc',
@@ skipping 1107 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'ash_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }