Add |legacy_destination_url| back to SessionMessage for EME

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_messaging_deprecated.h"
@@ skipping 156 matching lines @@
                                           uint32 promise_id,
                                           PP_Var web_session_id_var) = 0;
   virtual void PromiseRejected(PP_Instance instance,
                                uint32 promise_id,
                                PP_CdmExceptionCode exception_code,
                                uint32 system_code,
                                PP_Var error_description_var) = 0;
   virtual void SessionMessage(PP_Instance instance,
                               PP_Var web_session_id_var,
                               PP_CdmMessageType message_type,
-                              PP_Var message_var) = 0;
+                              PP_Var message_var,
+                              PP_Var legacy_destination_url_var) = 0;
   virtual void SessionKeysChange(
       PP_Instance instance,
       PP_Var web_session_id_var,
       PP_Bool has_additional_usable_key,
       uint32_t key_count,
       const struct PP_KeyInformation key_information[]) = 0;
   virtual void SessionExpirationChange(PP_Instance instance,
                                        PP_Var web_session_id_var,
                                        PP_Time new_expiry_time) = 0;
   virtual void SessionClosed(PP_Instance instance,
@@ skipping 37 matching lines @@
                                       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_