Fix loading placeholders for Lo-Fi

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 18de9a4285356fd2ddb05e57b41507077369464a..908f97b764d68bf23455e2b879925283acc1ec1b 100644
--- a/third_party/WebKit/Source/core/fetch/ImageResource.cpp
+++ b/third_party/WebKit/Source/core/fetch/ImageResource.cpp
@@ -522,14 +522,17 @@ void ImageResource::updateImageAnimationPolicy()
 
 void ImageResource::reloadIfLoFi(ResourceFetcher* fetcher)
 {
-    if (!m_response.httpHeaderField("chrome-proxy").contains("q=low"))
+    if (m_resourceRequest.loFiState() != WebURLRequest::LoFiOn)
+        return;
+    if (isLoaded() && !m_response.httpHeaderField("chrome-proxy").contains("q=low"))
         return;
     m_resourceRequest.setCachePolicy(WebCachePolicy::BypassingCache);
     m_resourceRequest.setLoFiState(WebURLRequest::LoFiOff);
     if (isLoading())
         m_loader->cancel();
-    else
-        updateImageAndClearBuffer();
+    clear();
+    m_data.clear();
+    notifyObservers();
     setStatus(NotStarted);
     fetcher->startLoad(this);
 }