Change cc::ElementId to be a uint64_t

third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.cpp

Index: third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.cpp b/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.cpp
index 6260949e4e7dd0c9f1aa81cc718d4a00608cafce..06e56ae6099c7f3cba53d4d12dbef4217aff9b2a 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.cpp
+++ b/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.cpp
@@ -39,12 +39,12 @@ String TransformPaintPropertyNode::ToString() const {
   auto transform = String::Format(
       "parent=%p transform=%s origin=%s flattensInheritedTransform=%s "
       "renderingContextId=%x directCompositingReasons=%s "
-      "compositorElementId=(%d, %d)",
+      "compositorElementId=%lu",
       parent_.Get(), matrix_.ToString().Ascii().data(),
       origin_.ToString().Ascii().data(),
       flattens_inherited_transform_ ? "yes" : "no", rendering_context_id_,
       CompositingReasonsAsString(direct_compositing_reasons_).Ascii().data(),
-      compositor_element_id_.primaryId, compositor_element_id_.secondaryId);
+      compositor_element_id_);
   if (scroll_)
     return transform + " scroll=" + scroll_->ToString();
   return transform;