Add |legacy_destination_url| back to SessionMessage for EME

ppapi/cpp/private/content_decryptor_private.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_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
 #define PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 63 matching lines @@
   // to the browser.
   void PromiseResolved(uint32_t promise_id);
   void PromiseResolvedWithSession(uint32_t promise_id,
                                   const std::string& web_session_id);
   void PromiseRejected(uint32_t promise_id,
                        PP_CdmExceptionCode exception_code,
                        uint32_t system_code,
                        const std::string& error_description);
   void SessionMessage(const std::string& web_session_id,
                       PP_CdmMessageType message_type,
-                      pp::VarArrayBuffer message);
+                      pp::VarArrayBuffer message,
+                      const std::string& legacy_destination_url);
   void SessionKeysChange(const std::string& web_session_id,
                          bool has_additional_usable_key,
                          const std::vector<PP_KeyInformation>& key_information);
   void SessionExpirationChange(const std::string& web_session_id,
                                PP_Time new_expiry_time);
   void SessionClosed(const std::string& web_session_id);
   void SessionError(const std::string& web_session_id,
                     PP_CdmExceptionCode exception_code,
                     uint32_t system_code,
                     const std::string& error_description);
@@ skipping 24 matching lines @@
   void DeliverSamples(pp::Buffer_Dev audio_frames,
                       const PP_DecryptedSampleInfo& decrypted_sample_info);
 
  private:
   InstanceHandle associated_instance_;
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_