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

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/input/EventHandlingUtil.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/layout/api/LayoutViewItem.h"
 #include "core/paint/PaintLayer.h"
@@ skipping 74 matching lines @@
 
 ScrollableArea* AssociatedScrollableArea(const PaintLayer* layer) {
   if (PaintLayerScrollableArea* scrollable_area = layer->GetScrollableArea()) {
     if (scrollable_area->ScrollsOverflow())
       return scrollable_area;
   }
 
   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.
   if (node.IsHTMLElement() && ToHTMLElement(node).IsInteractiveContent())
     return nullptr;
 
   return FlatTreeTraversal::Parent(node);
 }
 
 LayoutPoint ContentPointFromRootFrame(LocalFrame* frame,
@@ skipping 14 matching lines @@
 
   return frame->GetDocument()->PerformMouseEventHitTest(
       request,
       ContentPointFromRootFrame(frame,
                                 FlooredIntPoint(mev.PositionInRootFrame())),
       mev);
 }
 
 }  // namespace EventHandlingUtil
 }  // namespace blink