Use a FrameAssociatedLoader when downloading image resources.

content/public/renderer/resource_fetcher.h

Index: content/public/renderer/resource_fetcher.h
diff --git a/content/public/renderer/resource_fetcher.h b/content/public/renderer/resource_fetcher.h
index 5c010f999653a390f4c9d689c71a648afe8c6e37..778cadc38faa0c3201ec67adbd2860ecd485acb6 100644
--- a/content/public/renderer/resource_fetcher.h
+++ b/content/public/renderer/resource_fetcher.h
@@ -20,6 +20,7 @@ class TimeDelta;
 namespace blink {
 class WebFrame;
 class WebURLResponse;
+struct WebURLLoaderOptions;
 }
 
 namespace content {
@@ -53,6 +54,10 @@ class CONTENT_EXPORT ResourceFetcher {
   virtual void SetHeader(const std::string& header,
                          const std::string& value) = 0;
 
+  // Associate the corresponding WebURLLoaderOptions to the loader. Must be
+  // called before Start. Used if the LoaderType is FRAME_ASSOCIATED_LOADER.
+  virtual void SetLoaderOptions(const blink::WebURLLoaderOptions& options) = 0;
+
   // Starts the request using the specified frame.  Calls |callback| when
   // done.
   virtual void Start(blink::WebFrame* frame,