[TEST] Forbid ImageResourceContent::updateImage() reentrancy

third_party/WebKit/Source/core/loader/resource/ImageResourceContent.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/loader/resource/ImageResourceContent.h"
 
 #include "core/loader/resource/ImageResource.h"
 #include "core/loader/resource/ImageResourceInfo.h"
 #include "core/loader/resource/ImageResourceObserver.h"
 #include "core/svg/graphics/SVGImage.h"
@@ skipping 290 matching lines @@
     NotifyFinishOption notifyingFinishOption) {
   clearImage();
   notifyObservers(notifyingFinishOption);
 }
 
 void ImageResourceContent::updateImage(PassRefPtr<SharedBuffer> data,
                                        ClearImageOption clearImageOption,
                                        bool allDataReceived) {
   TRACE_EVENT0("blink", "ImageResourceContent::updateImage");
 
+  DCHECK(!m_isUpdateImageBeingCalled);
+  AutoReset<bool> scope(&m_isUpdateImageBeingCalled, true);
+
   if (clearImageOption == ImageResourceContent::ClearExistingImage) {
     clearImage();
   }
 
   // Have the image update its data from its internal buffer. It will not do
   // anything now, but will delay decoding until queried for info (like size or
   // specific image frames).
   if (data) {
     if (!m_image)
       m_image = createImage();
@@ skipping 147 matching lines @@
 
 const ResourceResponse& ImageResourceContent::response() const {
   return m_info->response();
 }
 
 const ResourceError& ImageResourceContent::resourceError() const {
   return m_info->resourceError();
 }
 
 }  // namespace blink