Allow override of user agent depending on url.

content/public/renderer/content_renderer_client.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 255 matching lines @@
                                         blink::WebFrame* frame);
 
   // Returns true if the page at |url| can use Pepper Compositor APIs.
   virtual bool IsPluginAllowedToUseCompositorAPI(const GURL& url);
 
   // Returns true if the page at |url| can use Pepper VideoDecoder APIs.
   virtual bool IsPluginAllowedToUseVideoDecodeAPI(const GURL& url);
 
   // Returns true if dev channel APIs are available for plugins.
   virtual bool IsPluginAllowedToUseDevChannelAPIs();
+
+  // Returns a user agent override specific for |url|, or empty string if
+  // default user agent should be used.
+  virtual std::string GetUserAgentOverrideForURL(const GURL& url);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_