Delegate dragend to the correct frame's EventHandler.

third_party/WebKit/Source/core/input/MouseEventManager.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/MouseEventManager.h"
 
 #include "core/clipboard/DataObject.h"
 #include "core/clipboard/DataTransfer.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementTraversal.h"
@@ skipping 890 matching lines @@
 void MouseEventManager::clearDragDataTransfer() {
   if (dragState().m_dragDataTransfer) {
     dragState().m_dragDataTransfer->clearDragImage();
     dragState().m_dragDataTransfer->setAccessPolicy(DataTransferNumb);
   }
 }
 
 void MouseEventManager::dragSourceEndedAt(const PlatformMouseEvent& event,
                                           DragOperation operation) {
   // Send a hit test request so that Layer gets a chance to update the :hover
-  // and :active pseudoclasses..
+  // and :active pseudoclasses.
+  // TODO(crbug.com/661842): This should be redundant with the hit test in
+  // EventHandler::dragSourceEndedAt, but isn't. Figure out why, then remove the
+  // test here.
   HitTestRequest request(HitTestRequest::Release);
   EventHandlingUtil::performMouseEventHitTest(m_frame, request, event);
 
   if (dragState().m_dragSrc) {
     dragState().m_dragDataTransfer->setDestinationOperation(operation);
     // For now we don't care if event handler cancels default behavior, since
     // there is none.
     dispatchDragSrcEvent(EventTypeNames::dragend, event);
   }
   clearDragDataTransfer();
@@ skipping 77 matching lines @@
 
 void MouseEventManager::setClickCount(int clickCount) {
   m_clickCount = clickCount;
 }
 
 bool MouseEventManager::mouseDownMayStartDrag() {
   return m_mouseDownMayStartDrag;
 }
 
 }  // namespace blink