Use element id's for animations

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 34 matching lines @@
         'animation/animation_host.cc',
         'animation/animation_host.h',
         'animation/animation_id_provider.cc',
         'animation/animation_id_provider.h',
         'animation/animation_player.cc',
         'animation/animation_player.h',
         'animation/animation_timeline.cc',
         'animation/animation_timeline.h',
         'animation/element_animations.cc',
         'animation/element_animations.h',
+        'animation/element_id.cc',
+        'animation/element_id.h',
         'animation/keyframed_animation_curve.cc',
         'animation/keyframed_animation_curve.h',
         'animation/scroll_offset_animation_curve.cc',
         'animation/scroll_offset_animation_curve.h',
         'animation/scroll_offset_animations_impl.cc',
         'animation/scroll_offset_animations_impl.h',
         'animation/scroll_offset_animations.cc',
         'animation/scroll_offset_animations.h',
         'animation/target_property.cc',
         'animation/target_property.h',
@@ skipping 546 matching lines @@
       # GN version: "//cc/proto"
       'target_name': 'cc_proto',
       'type': '<(component)',
       'sources': [
         'proto/begin_main_frame_and_commit_state.proto',
         'proto/commit_earlyout_reason.proto',
         'proto/compositor_message.proto',
         'proto/compositor_message_to_impl.proto',
         'proto/compositor_message_to_main.proto',
         'proto/display_item.proto',
+        'proto/element_id.proto',
         'proto/layer.proto',
         'proto/layer_position_constraint.proto',
         'proto/layer_tree_debug_state.proto',
         'proto/layer_tree_host.proto',
         'proto/layer_tree_settings.proto',
         'proto/layer_selection_bound.proto',
         'proto/managed_memory_policy.proto',
         'proto/memory_allocation.proto',
         'proto/point.proto',
         'proto/point3f.proto',
@@ skipping 72 matching lines @@
         'surfaces/surface_resource_holder.h',
         'surfaces/surface_sequence.h',
         'surfaces/surfaces_export.h',
       ],
       'includes': [
         '../build/android/increase_size_for_speed.gypi',
       ],
     },
   ],
 }