Move download messages from Renderer to Frame filter.

third_party/WebKit/public/web/WebFrameClient.h

Index: third_party/WebKit/public/web/WebFrameClient.h
diff --git a/third_party/WebKit/public/web/WebFrameClient.h b/third_party/WebKit/public/web/WebFrameClient.h
index aa09796f670264040a0f85fc2c41d9c337707972..e99540e2f17d390ba71413addb6c8881c2cda918 100644
--- a/third_party/WebKit/public/web/WebFrameClient.h
+++ b/third_party/WebKit/public/web/WebFrameClient.h
@@ -444,6 +444,10 @@ public:
     // the given frame. Additional context data is supplied.
     virtual void showContextMenu(const WebContextMenuData&) { }
 
+    // This method is called in response to WebView's saveImageAt(x, y).
+    // A data url from <canvas> or <img> is passed to the method's argument.
+    virtual void saveImageFromDataURL(const WebString&) { }
+
     // Low-level resource notifications ------------------------------------
 
     // A request is about to be sent out, and the client may modify it.  Request