CC Animation: Make ElementAnimations a ref-counted object.

cc/test/animation_timelines_test_common.cc

Index: cc/test/animation_timelines_test_common.cc
diff --git a/cc/test/animation_timelines_test_common.cc b/cc/test/animation_timelines_test_common.cc
index 1f6fb9b8d66eff8232100a4ae3c7624d5f17fea1..5525032703d68077236030eecbedc99345497324 100644
--- a/cc/test/animation_timelines_test_common.cc
+++ b/cc/test/animation_timelines_test_common.cc
@@ -246,14 +246,14 @@ void AnimationTimelinesTest::AnimateLayersTransferEvents(
 }
 
 AnimationPlayer* AnimationTimelinesTest::GetPlayerForLayerId(int layer_id) {
-  const ElementAnimations* element_animations =
+  const scoped_refptr<ElementAnimations> element_animations =
       host_->GetElementAnimationsForLayerId(layer_id);
   return element_animations ? element_animations->players_list().head()->value()
                             : nullptr;
 }
 
 AnimationPlayer* AnimationTimelinesTest::GetImplPlayerForLayerId(int layer_id) {
-  const ElementAnimations* element_animations =
+  const scoped_refptr<ElementAnimations> element_animations =
       host_impl_->GetElementAnimationsForLayerId(layer_id);
   return element_animations ? element_animations->players_list().head()->value()
                             : nullptr;