Add scroll_offset and scroll_snap to transform_node's traced value

cc/trees/transform_node.cc

Index: cc/trees/transform_node.cc
diff --git a/cc/trees/transform_node.cc b/cc/trees/transform_node.cc
index 34dd9af559fc1794c303f866f99005321c2581dd..dd62aa88532398b461d5e544e8ed899dcce225f4 100644
--- a/cc/trees/transform_node.cc
+++ b/cc/trees/transform_node.cc
@@ -231,6 +231,8 @@ void TransformNode::AsValueInto(base::trace_event::TracedValue* value) const {
   value->SetInteger("content_target_id", 0);
   value->SetInteger("source_node_id", source_node_id);
   value->SetInteger("sorting_context_id", sorting_context_id);
+  MathUtil::AddToTracedValue("scroll_offset", scroll_offset, value);
+  MathUtil::AddToTracedValue("scroll_snap", scroll_snap, value);
 }
 
 TransformCachedNodeData::TransformCachedNodeData()