[TEST] Forbid ImageResourceContent::updateImage() reentrancy

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

Index: third_party/WebKit/Source/core/loader/resource/ImageResourceContent.cpp
diff --git a/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.cpp b/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.cpp
index 60998017672bdc16522f24c37a891ae6385261d9..9cebb73b2d15ea786e1738421a032664e0168ca6 100644
--- a/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.cpp
+++ b/third_party/WebKit/Source/core/loader/resource/ImageResourceContent.cpp
@@ -308,6 +308,9 @@ void ImageResourceContent::updateImage(PassRefPtr<SharedBuffer> data,
                                        bool allDataReceived) {
   TRACE_EVENT0("blink", "ImageResourceContent::updateImage");
 
+  DCHECK(!m_isUpdateImageBeingCalled);
+  AutoReset<bool> scope(&m_isUpdateImageBeingCalled, true);
+
   if (clearImageOption == ImageResourceContent::ClearExistingImage) {
     clearImage();
   }