Stop dispatching notifyFinished for each part in a multipart response

third_party/WebKit/Source/core/fetch/ImageResource.cpp

Index: third_party/WebKit/Source/core/fetch/ImageResource.cpp
diff --git a/third_party/WebKit/Source/core/fetch/ImageResource.cpp b/third_party/WebKit/Source/core/fetch/ImageResource.cpp
index caaac704bf2695a5c38c3c53dec4c1098c0ea789..8e2c9bd2964f75c130dd2e0565b70a89f7861510 100644
--- a/third_party/WebKit/Source/core/fetch/ImageResource.cpp
+++ b/third_party/WebKit/Source/core/fetch/ImageResource.cpp
@@ -465,19 +465,28 @@ void ImageResource::changedInRect(const blink::Image* image, const IntRect& rect
     notifyObservers(&rect);
 }
 
-void ImageResource::onePartInMultipartReceived(const ResourceResponse& response, bool isFirstPart)
+void ImageResource::onePartInMultipartReceived(const ResourceResponse& response)
 {
     ASSERT(m_multipartParser);
+
     m_response = response;
-    if (m_data) {
-        clear();
-        updateImage(true);
-        m_data.clear();
+    if (m_multipartParsingState == MultipartParsingState::WaitingForFirstPart) {
+        // We have nothing to do because we don't have any data.
+        m_multipartParsingState = MultipartParsingState::ParsingFirstPart;
+        return;
+    }
+    clear();
+    updateImage(true);
+    m_data.clear();
+
+    if (m_multipartParsingState == MultipartParsingState::ParsingFirstPart) {
+        m_multipartParsingState = MultipartParsingState::FinishedParsingFirstPart;
+        // Notify finished when the first part ends.
         setLoading(false);
         checkNotify();
+        if (m_loader)
+            m_loader->didFinishLoadingOnePart(0, WebURLLoaderClient::kUnknownEncodedDataLength);
     }
-    if (!isFirstPart && m_loader)
-        m_loader->didFinishLoadingOnePart(0, WebURLLoaderClient::kUnknownEncodedDataLength);
 }
 
 void ImageResource::multipartDataReceived(const char* bytes, size_t size)