Fix the wrong non-element node handling in EventHanlder and MouseEventManager

third_party/WebKit/Source/core/input/EventHandlingUtil.cpp

Index: third_party/WebKit/Source/core/input/EventHandlingUtil.cpp
diff --git a/third_party/WebKit/Source/core/input/EventHandlingUtil.cpp b/third_party/WebKit/Source/core/input/EventHandlingUtil.cpp
index 8ce9d0cac29983c8d1b672e86243e670d4b616e1..0872c3ac80eb61dceed1e067cf3500d9f46606ca 100644
--- a/third_party/WebKit/Source/core/input/EventHandlingUtil.cpp
+++ b/third_party/WebKit/Source/core/input/EventHandlingUtil.cpp
@@ -92,6 +92,14 @@ ScrollableArea* AssociatedScrollableArea(const PaintLayer* layer) {
   return nullptr;
 }
 
+Element* ParentElementIfNeeded(Node* node) {
+  if (!node)
+    return nullptr;
+  if (node->IsElementNode())
+    return ToElement(node);
+  return FlatTreeTraversal::ParentElement(*node);
+}
+
 ContainerNode* ParentForClickEvent(const Node& node) {
   // IE doesn't dispatch click events for mousedown/mouseup events across form
   // controls.