Move download messages from Renderer to Frame filter.

third_party/WebKit/public/web/WebFrameClient.h

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 426 matching lines @@
     // the user selects 'OK' or false otherwise.
     virtual bool runModalBeforeUnloadDialog(bool isReload) { return true; }
 
 
     // UI ------------------------------------------------------------------
 
     // Shows a context menu with commands relevant to a specific element on
     // 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
     // is writable, and changes to the URL, for example, will change the request
     // made.  If this request is the result of a redirect, then redirectResponse
     // will be non-null and contain the response that triggered the redirect.
     virtual void willSendRequest(
         WebLocalFrame*, unsigned identifier, WebURLRequest&,
         const WebURLResponse& redirectResponse) { }
 
@@ skipping 247 matching lines @@
     // Mojo ----------------------------------------------------------------
     virtual ServiceRegistry* serviceRegistry() { return nullptr; }
 
 protected:
     virtual ~WebFrameClient() { }
 };
 
 } // namespace blink
 
 #endif