Change cc::ElementId to be a uint64_t

third_party/WebKit/Source/core/page/scrolling/ScrollState.cpp

Index: third_party/WebKit/Source/core/page/scrolling/ScrollState.cpp
diff --git a/third_party/WebKit/Source/core/page/scrolling/ScrollState.cpp b/third_party/WebKit/Source/core/page/scrolling/ScrollState.cpp
index c28dc3770c577fcfcaf88c1f737a99ab704d2db8..801034941295c5d5379c64f8fb811f6b8f1dd529 100644
--- a/third_party/WebKit/Source/core/page/scrolling/ScrollState.cpp
+++ b/third_party/WebKit/Source/core/page/scrolling/ScrollState.cpp
@@ -93,10 +93,11 @@ void ScrollState::ConsumeDeltaNative(double x, double y) {
 }
 
 Element* ScrollState::CurrentNativeScrollingElement() const {
-  uint64_t element_id = data_->current_native_scrolling_element().primaryId;
-  if (element_id == 0)
+  DOMNodeId dom_node_id = DomNodeIdFromCompositorElementId(
+      data_->current_native_scrolling_element());
+  if (!dom_node_id)
     return nullptr;
-  return ElementForId(element_id);
+  return ElementForId(dom_node_id);
 }
 
 void ScrollState::SetCurrentNativeScrollingElement(Element* element) {