Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ash/ash.gyp

Index: ash/ash.gyp
diff --git a/ash/ash.gyp b/ash/ash.gyp
index 5bbcd9d42d4076b1a9990824c675f29c8ca87e08..ada5c6608260848b0aeb4e8c133901dff2d7646c 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -75,6 +75,9 @@
       'common/session/session_types.h',
       'common/shelf/shelf_alignment_menu.cc',
       'common/shelf/shelf_alignment_menu.h',
+      'common/shelf/shelf_background_animator.cc',
+      'common/shelf/shelf_background_animator.h',
+      'common/shelf/shelf_background_animator_observer.h',
       'common/shelf/shelf_constants.cc',
       'common/shelf/shelf_constants.h',
       'common/shelf/shelf_item_delegate.h',
@@ -789,8 +792,8 @@
       'test/cursor_manager_test_api.h',
       'test/display_manager_test_api.cc',
       'test/display_manager_test_api.h',
-      'test/material_design_controller_test_api.cc',
-      'test/material_design_controller_test_api.h',
+      'common/material_design/test/material_design_controller_test_api.cc',

[James Cook, 2016/06/14 17:50:00]

nit: Sort includes.

Also, I would prefer this either go in //ash/common/test (to mirror //ash/test)
or in //ash/common/material_design (to sit next to the file under test).

[bruthig, 2016/07/26 19:50:01]

Moved to //ash/common/test

+      'common/material_design/test/material_design_controller_test_api.h',
       'test/mirror_window_test_api.cc',
       'test/mirror_window_test_api.h',
       'test/overflow_bubble_view_test_api.cc',
@@ -896,6 +899,7 @@
       'ash_touch_exploration_manager_chromeos_unittest.cc',
       'autoclick/autoclick_unittest.cc',
       'common/material_design/material_design_controller_unittest.cc',
+      'common/shelf/shelf_background_animator_unittest.cc',
       'common/shelf/shelf_model_unittest.cc',
       'common/system/update/tray_update_unittest.cc',
       'content/display/screen_orientation_controller_chromeos_unittest.cc',