Add a function to convert key system into UUID

webkit/renderer/media/crypto/key_systems.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 WEBKIT_RENDERER_MEDIA_CRYPTO_KEY_SYSTEMS_H_
 #define WEBKIT_RENDERER_MEDIA_CRYPTO_KEY_SYSTEMS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 22 matching lines @@
 
 // Returns whether AesDecryptor can be used for the given |key_system|.
 bool CanUseAesDecryptor(const std::string& key_system);
 
 #if defined(ENABLE_PEPPER_CDMS)
 // Returns the Pepper MIME type for |key_system|.
 // Returns an empty string if |key_system| is unknown or not Pepper-based.
 std::string GetPepperType(const std::string& key_system);
 #endif
 
+#if defined(OS_ANDROID)
+// Convert |key_system| to 16-byte Android UUID.
+std::vector<uint8> GetUUID(const std::string& key_system);
+#endif
+
 }  // namespace webkit_media
 
 #endif  // WEBKIT_RENDERER_MEDIA_CRYPTO_KEY_SYSTEMS_H_