Align drag feedback for links with draggable="true" to Safari.

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 793 matching lines @@
 }
 
 bool MouseEventManager::tryStartDrag(
     const MouseEventWithHitTestResults& event) {
   // The DataTransfer would only be non-empty if we missed a dragEnd.
   // Clear it anyway, just to make sure it gets numbified.
   clearDragDataTransfer();
 
   dragState().m_dragDataTransfer = createDraggingDataTransfer();
 
-  // Check to see if this a DOM based drag, if it is get the DOM specified drag
-  // image and offset
-  if (dragState().m_dragType == DragSourceActionDHTML) {
-    if (LayoutObject* layoutObject = dragState().m_dragSrc->layoutObject()) {
-      IntRect boundingIncludingDescendants =
-          layoutObject->absoluteBoundingBoxRectIncludingDescendants();
-      IntSize delta = m_mouseDownPos - boundingIncludingDescendants.location();
-      dragState().m_dragDataTransfer->setDragImageElement(
-          dragState().m_dragSrc.get(), IntPoint(delta));
-    } else {
-      // The layoutObject has disappeared, this can happen if the onStartDrag
-      // handler has hidden the element in some way. In this case we just kill
-      // the drag.
-      return false;
-    }
-  }
-
   DragController& dragController = m_frame->page()->dragController();
   if (!dragController.populateDragDataTransfer(m_frame, dragState(),
                                                m_mouseDownPos))
     return false;
 
   // If dispatching dragstart brings about another mouse down -- one way
   // this will happen is if a DevTools user breaks within a dragstart
   // handler and then clicks on the suspended page -- the drag state is
   // reset. Hence, need to check if this particular drag operation can
   // continue even if dispatchEvent() indicates no (direct) cancellation.
@@ skipping 153 matching lines @@
 
 void MouseEventManager::setClickCount(int clickCount) {
   m_clickCount = clickCount;
 }
 
 bool MouseEventManager::mouseDownMayStartDrag() {
   return m_mouseDownMayStartDrag;
 }
 
 }  // namespace blink