Add |legacy_destination_url| back to SessionMessage for EME

ppapi/api/private/ppb_content_decryptor_private.idl

 /* 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.
  */
 
 /**
  * This file defines the <code>PPB_ContentDecryptor_Private</code>
  * interface. Note: This is a special interface, only to be used for Content
  * Decryption Modules, not normal plugins.
  */
@@ skipping 71 matching lines @@
    *
    * @param[in] web_session_id A <code>PP_Var</code> of type
    * <code>PP_VARTYPE_STRING</code> containing the ID of a session for
    * which this message is intended.
    *
    * @param[in] message_type A <code>PP_CdmMessageType</code> containing the
    * message type.
    *
    * @param[in] message A <code>PP_Var</code> of type
    * <code>PP_VARTYPE_ARRAY_BUFFER</code> that contains the message.
+   *
+   * @param[in] legacy_destination_url A <code>PP_Var</code> of type
+   * <code>PP_VARTYPE_STRING</code> containing the destination URL for the
+   * message.
    */
   void SessionMessage(
       [in] PP_Instance instance,
       [in] PP_Var web_session_id,
       [in] PP_CdmMessageType message_type,
-      [in] PP_Var message);
+      [in] PP_Var message,
+      [in] PP_Var legacy_destination_url);
 
   /**
    * The keys for a session have changed.
    *
    * @param[in] web_session_id A <code>PP_Var</code> of type
    * <code>PP_VARTYPE_STRING</code> containing the ID of the session that has
    * a change in keys.
    *
    * @param[in] has_additional_usable_key A <code>PP_Bool</code> indicating if
    * a new usable key has been added.
@@ skipping 193 matching lines @@
    *
    * @param[in] decrypted_sample_info A <code>PP_DecryptedSampleInfo</code> that
    * contains the tracking info and result code associated with the decrypted
    * samples.
    */
   void DeliverSamples(
       [in] PP_Instance instance,
       [in] PP_Resource audio_frames,
       [in] PP_DecryptedSampleInfo decrypted_sample_info);
 };