Added a CallbackLayerAnimationObserver.

ui/compositor/compositor.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,
   },
   'targets': [
     {
       'target_name': 'compositor',
       'type': '<(component)',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
         '<(DEPTH)/base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '<(DEPTH)/cc/cc.gyp:cc',
         '<(DEPTH)/cc/cc.gyp:cc_surfaces',
         '<(DEPTH)/gpu/gpu.gyp:command_buffer_common',
         '<(DEPTH)/skia/skia.gyp:skia',
         '<(DEPTH)/ui/gfx/gfx.gyp:gfx',
         '<(DEPTH)/ui/gfx/gfx.gyp:gfx_geometry',
         '<(DEPTH)/ui/gl/gl.gyp:gl',
       ],
       'defines': [
         'COMPOSITOR_IMPLEMENTATION',
       ],
       'sources': [
+        'callback_layer_animation_observer.cc',
+        'callback_layer_animation_observer.h',
         'canvas_painter.cc',
         'canvas_painter.h',
         'clip_transform_recorder.cc',
         'clip_transform_recorder.h',
         'closure_animation_observer.cc',
         'closure_animation_observer.h',
         'compositing_recorder.cc',
         'compositing_recorder.h',
         'compositor.cc',
         'compositor.h',
@@ skipping 75 matching lines @@
       ],
       'sources': [
         'test/context_factories_for_test.cc',
         'test/context_factories_for_test.h',
         'test/draw_waiter_for_test.cc',
         'test/draw_waiter_for_test.h',
         'test/in_process_context_factory.cc',
         'test/in_process_context_factory.h',
         'test/in_process_context_provider.cc',
         'test/in_process_context_provider.h',
+        'test/layer_animation_observer_test_api.cc',
+        'test/layer_animation_observer_test_api.h',
         'test/layer_animator_test_controller.cc',
         'test/layer_animator_test_controller.h',
         'test/test_compositor_host.h',
         'test/test_compositor_host_mac.mm',
         'test/test_compositor_host_ozone.cc',
         'test/test_compositor_host_win.cc',
         'test/test_compositor_host_x11.cc',
         'test/test_layer_animation_delegate.cc',
         'test/test_layer_animation_delegate.h',
         'test/test_layer_animation_observer.cc',
@@ skipping 27 matching lines @@
         '<(DEPTH)/testing/gtest.gyp:gtest',
         '<(DEPTH)/ui/base/ui_base.gyp:ui_base',
         '<(DEPTH)/ui/gfx/gfx.gyp:gfx',
         '<(DEPTH)/ui/gfx/gfx.gyp:gfx_geometry',
         '<(DEPTH)/ui/gl/gl.gyp:gl',
         '<(DEPTH)/ui/resources/ui_resources.gyp:ui_resources',
         'compositor',
         'compositor_test_support',
       ],
       'sources': [
+        'callback_layer_animation_observer_unittest.cc',
         'compositor_unittest.cc',
         'layer_animation_element_unittest.cc',
         'layer_animation_sequence_unittest.cc',
         'layer_animator_unittest.cc',
         'layer_owner_unittest.cc',
         'layer_unittest.cc',
         'run_all_unittests.cc',
         'transform_animation_curve_adapter_unittest.cc',
       ],
       'conditions': [
@@ skipping 31 matching lines @@
               'dependencies': [
                 '../../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }