cc: Use Element Id to Record Animation Changes

cc/trees/layer_tree_host_common_unittest.cc

Index: cc/trees/layer_tree_host_common_unittest.cc
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index fa2c75fd06de2c4a9cdc69caafbb66b63c07acf2..47d008d75a6af9c9e8e379d4d0b57e9945297885 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -2553,7 +2553,6 @@ TEST_F(LayerTreeHostCommonTest, AnimationsForRenderSurfaceHierarchy) {
       gfx::Point3F(0.25f, 0.f, 0.f);
 
   root->layer_tree_impl()->BuildLayerListAndPropertyTreesForTesting();
-  SetElementIdsForTesting();
 
   // Put an animated opacity on the render surface.
   AddOpacityTransitionToElementWithPlayer(
@@ -5073,7 +5072,6 @@ TEST_F(LayerTreeHostCommonTest, OpacityAnimatingOnPendingTree) {
   scoped_refptr<AnimationTimeline> timeline =
       AnimationTimeline::Create(AnimationIdProvider::NextTimelineId());
   host_impl.animation_host()->AddAnimationTimeline(timeline);
-  host_impl.pending_tree()->SetElementIdsForTesting();
 
   ElementId child_element_id =
       host_impl.pending_tree()->LayerById(child_id)->element_id();