cc: Support animating scroll offset

cc/cc.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': [
     {
@@ skipping 24 matching lines @@
         'animation/animation_id_provider.cc',
         'animation/animation_id_provider.h',
         'animation/animation_registrar.cc',
         'animation/animation_registrar.h',
         'animation/keyframed_animation_curve.cc',
         'animation/keyframed_animation_curve.h',
         'animation/layer_animation_controller.cc',
         'animation/layer_animation_controller.h',
         'animation/layer_animation_event_observer.h',
         'animation/layer_animation_value_observer.h',
+        'animation/layer_animation_value_provider.h',
         'animation/scroll_offset_animation_curve.cc',
         'animation/scroll_offset_animation_curve.h',
         'animation/scrollbar_animation_controller.h',
         'animation/scrollbar_animation_controller_linear_fade.cc',
         'animation/scrollbar_animation_controller_linear_fade.h',
         'animation/scrollbar_animation_controller_thinning.cc',
         'animation/scrollbar_animation_controller_thinning.h',
         'animation/timing_function.cc',
         'animation/timing_function.h',
         'animation/transform_operation.cc',
@@ skipping 381 matching lines @@
         'trees/thread_proxy.cc',
         'trees/thread_proxy.h',
         'trees/tree_synchronizer.cc',
         'trees/tree_synchronizer.h',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
     },
   ],
 }