Add GetPluginRefererURL to PPB_URLUtil_Dev interface to get the 'Referer' HTTP header value that wa…

ppapi/thunk/ppb_instance_api.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 PPAPI_THUNK_INSTANCE_API_H_
 #define PPAPI_THUNK_INSTANCE_API_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "ppapi/c/dev/ppb_url_util_dev.h"
@@ skipping 171 matching lines @@
   // URLUtil.
   virtual PP_Var ResolveRelativeToDocument(
       PP_Instance instance,
       PP_Var relative,
       PP_URLComponents_Dev* components) = 0;
   virtual PP_Bool DocumentCanRequest(PP_Instance instance, PP_Var url) = 0;
   virtual PP_Bool DocumentCanAccessDocument(PP_Instance instance,
                                             PP_Instance target) = 0;
   virtual PP_Var GetPluginInstanceURL(PP_Instance instance,
                                       PP_URLComponents_Dev* components) = 0;
+  virtual PP_Var GetPluginReferrerURL(PP_Instance instance,
+                                      PP_URLComponents_Dev* components) = 0;
 #endif  // !defined(OS_NACL)
 
   static const ApiID kApiID = API_ID_PPB_INSTANCE;
 };
 
 }  // namespace thunk
 }  // namespace ppapi
 
 #endif  // PPAPI_THUNK_INSTANCE_API_H_