Disable compositing query assert when dragging

Source/core/clipboard/Clipboard.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "HTMLNames.h"
 #include "core/clipboard/DataObject.h"
 #include "core/clipboard/DataTransferItem.h"
 #include "core/clipboard/DataTransferItemList.h"
 #include "core/editing/markup.h"
 #include "core/fetch/ImageResource.h"
 #include "core/fileapi/FileList.h"
 #include "core/frame/LocalFrame.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/rendering/RenderImage.h"
+#include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderObject.h"
 #include "platform/DragImage.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/clipboard/ClipboardMimeTypes.h"
 #include "platform/clipboard/ClipboardUtilities.h"
 
 namespace WebCore {
 
 // These "conversion" methods are called by both WebCore and WebKit, and never make sense to JS, so we don't
 // worry about security for these. They don't allow access to the pasteboard anyway.
@@ skipping 185 matching lines @@
 
 void Clipboard::setDragImageElement(Node* node, const IntPoint& loc)
 {
     setDragImage(0, node, loc);
 }
 
 PassOwnPtr<DragImage> Clipboard::createDragImage(IntPoint& loc, LocalFrame* frame) const
 {
     if (m_dragImageElement) {
         loc = m_dragLoc;
+
+        // https://code.google.com/p/chromium/issues/detail?id=354373
+        DisableCompositingQueryAsserts disabler;
         return frame->nodeImage(m_dragImageElement.get());
     }
     if (m_dragImage) {
         loc = m_dragLoc;
         return DragImage::create(m_dragImage->image());
     }
     return nullptr;
 }
 
 static ImageResource* getImageResource(Element* element)
@@ skipping 267 matching lines @@
         return String("copy");
     }
 }
 
 void Clipboard::trace(Visitor* visitor)
 {
     visitor->trace(m_dataObject);
 }
 
 } // namespace WebCore