Change cc::ElementId to be a uint64_t

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 2221 matching lines @@
                                   CompositorMutableProperty::kTransform) &
                                  compositor_mutable_properties;
     scroll_mutable_properties = (CompositorMutableProperty::kScrollLeft |
                                  CompositorMutableProperty::kScrollTop) &
                                 compositor_mutable_properties;
   }
 
   if (animating_style && animating_style->ShouldCompositeForCurrentAnimations())
     element_id = DOMNodeIds::IdForNode(owning_node);
 
-  CompositorElementId compositor_element_id;
+  CompositorElementId compositor_element_id = kInvalidElementId;
   if (element_id)
     compositor_element_id =
         CreateCompositorElementId(element_id, CompositorSubElementId::kPrimary);
 
   graphics_layer_->SetElementId(compositor_element_id);
   graphics_layer_->SetCompositorMutableProperties(primary_mutable_properties);
 
   // We always set the elementId for m_scrollingContentsLayer since it can be
   // animated for smooth scrolling, so we don't need to set it conditionally
   // here.
@@ skipping 1362 matching lines @@
   } else if (graphics_layer == decoration_outline_layer_.get()) {
     name = "Decoration Layer";
   } else {
     NOTREACHED();
   }
 
   return name;
 }
 
 }  // namespace blink