Fix cc scrollbar layer issues with initialization, and use element ids throughout.

third_party/WebKit/Source/core/animation/Animation.cpp

Index: third_party/WebKit/Source/core/animation/Animation.cpp
diff --git a/third_party/WebKit/Source/core/animation/Animation.cpp b/third_party/WebKit/Source/core/animation/Animation.cpp
index 1cbacd8654da67728ae677d0ee5120538f098a54..af5fdce15eb55b9ed1d6e028a1e8068be0649b55 100644
--- a/third_party/WebKit/Source/core/animation/Animation.cpp
+++ b/third_party/WebKit/Source/core/animation/Animation.cpp
@@ -752,9 +752,9 @@ bool Animation::CanStartAnimationOnCompositor(
     if (!target_element)
       return false;
 
-    CompositorElementId target_element_id =
-        CreateCompositorElementId(DOMNodeIds::IdForNode(target_element),
-                                  CompositorSubElementId::kPrimary);
+    CompositorElementId target_element_id = CompositorElementIdFromDOMNodeId(
+        DOMNodeIds::IdForNode(target_element),
+        CompositorElementIdNamespace::kPrimary);
     if (!composited_element_ids->Contains(target_element_id))
       return false;
   }