media: Support unprefixed EME API on Android.

media/base/cdm_key_information.h

 // Copyright 2015 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_CDM_KEY_INFORMATION_H_
 #define MEDIA_BASE_CDM_KEY_INFORMATION_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 struct MEDIA_EXPORT CdmKeyInformation {
   enum KeyStatus {
     USABLE = 0,
     INTERNAL_ERROR = 1,
     EXPIRED = 2,
-    OUTPUT_NOT_ALLOWED = 3
+    OUTPUT_NOT_ALLOWED = 3,
+    KEY_STATUS_MAX = OUTPUT_NOT_ALLOWED
   };
 
   CdmKeyInformation();
   ~CdmKeyInformation();
 
   std::vector<uint8> key_id;
   KeyStatus status;
   uint32 system_code;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_CDM_KEY_INFORMATION_H_