Use element id's for animations

cc/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
     "animation/animation_curve.cc",
     "animation/animation_curve.h",
     "animation/animation_delegate.h",
     "animation/animation_events.cc",
     "animation/animation_events.h",
     "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.cc",
     "animation/scroll_offset_animations.h",
     "animation/scroll_offset_animations_impl.cc",
     "animation/scroll_offset_animations_impl.h",
     "animation/target_property.cc",
     "animation/target_property.h",
@@ skipping 991 matching lines @@
     "//ui/gfx/geometry",
     "//ui/gl",
     "//ui/gl:test_support",
   ]
 
   # This target should not require the Chrome executable to run.
   assert_no_deps = [ "//chrome" ]
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the cc_unittests_run target in cc_tests.gyp.