Allows support for persistent session types in BrowserCdm.

media/base/media_keys.h

 // Copyright 2013 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 MEDIA_BASE_MEDIA_KEYS_H_
 #define MEDIA_BASE_MEDIA_KEYS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 54 matching lines @@
     OUTPUT_ERROR,
     EXCEPTION_MAX = OUTPUT_ERROR
   };
 
   // Type of license required when creating/loading a session.
   // Must be consistent with the values specified in the spec:
   // https://w3c.github.io/encrypted-media/#idl-def-MediaKeySessionType
   enum SessionType {
     TEMPORARY_SESSION,
     PERSISTENT_LICENSE_SESSION,
-    PERSISTENT_RELEASE_MESSAGE_SESSION
+    PERSISTENT_RELEASE_MESSAGE_SESSION,
+    SESSION_TYPE_MAX = PERSISTENT_RELEASE_MESSAGE_SESSION
   };
 
   // Type of message being sent to the application.
   // Must be consistent with the values specified in the spec:
   // https://w3c.github.io/encrypted-media/#idl-def-MediaKeyMessageType
   enum MessageType {
     LICENSE_REQUEST,
     LICENSE_RENEWAL,
     LICENSE_RELEASE,
     MESSAGE_TYPE_MAX = LICENSE_RELEASE
@@ skipping 82 matching lines @@
                             bool has_additional_usable_key,
                             CdmKeysInfo keys_info)> SessionKeysChangeCB;
 
 typedef base::Callback<void(const std::string& session_id,
                             const base::Time& new_expiry_time)>
     SessionExpirationUpdateCB;
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_KEYS_H_