Use an auxiliary list of animation controllers.

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': {
     'cc_source_files': [
       'active_animation.cc',
       'active_animation.h',
       'animation_curve.cc',
       'animation_curve.h',
       'animation_events.h',
+      'animation_registrar.h',
       'append_quads_data.h',
       'bitmap_content_layer_updater.cc',
       'bitmap_content_layer_updater.h',
       'bitmap_skpicture_content_layer_updater.cc',
       'bitmap_skpicture_content_layer_updater.h',
       'caching_bitmap_content_layer_updater.cc',
       'caching_bitmap_content_layer_updater.h',
       'checkerboard_draw_quad.cc',
       'checkerboard_draw_quad.h',
       'completion_event.h',
@@ skipping 263 matching lines @@
       ],
       'all_dependent_settings': {
         'include_dirs': [
           # Needed for <public/WebTransformationMatrix.h> in layer.h
           '<(webkit_src_dir)/Source/Platform/chromium',
         ],
       }
     },
   ],
 }