[TEST] Forbid ImageResourceContent::updateImage() reentrancy

third_party/WebKit/Source/core/loader/resource/ImageResourceContent.h

 // 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.
 
 #ifndef ImageResourceContent_h
 #define ImageResourceContent_h
 
 #include "core/CoreExport.h"
 #include "core/fetch/ResourceStatus.h"
 #include "platform/geometry/IntRect.h"
@@ skipping 143 matching lines @@
   RefPtr<blink::Image> m_image;
 
   HashCountedSet<ImageResourceObserver*> m_observers;
   HashCountedSet<ImageResourceObserver*> m_finishedObservers;
 
   Image::SizeAvailability m_sizeAvailable = Image::SizeUnavailable;
 
   // Indicates if this resource's encoded image data can be purged and refetched
   // from disk cache to save memory usage. See crbug/664437.
   bool m_isRefetchableDataFromDiskCache;
+
+  bool m_isUpdateImageBeingCalled = false;
 };
 
 }  // namespace blink
 
 #endif