Load CMA backend from shared library

chromecast/media/base/key_systems_common.h

 // Copyright 2014 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 CHROMECAST_MEDIA_BASE_KEY_SYSTEMS_COMMON_H_
 #define CHROMECAST_MEDIA_BASE_KEY_SYSTEMS_COMMON_H_
 
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/compiler_specific.h"
+#include "chromecast/public/media/cast_key_system.h"
 #include "media/base/android/media_client_android.h"
 
 namespace chromecast {
 namespace media {
 
 #if defined(PLAYREADY_CDM_AVAILABLE)
 extern const char kChromecastPlayreadyKeySystem[];
 #endif  // defined(PLAYREADY_CDM_AVAILABLE)
 
-enum CastKeySystem {
-  KEY_SYSTEM_NONE = 0,
-  KEY_SYSTEM_CLEAR_KEY,
-  KEY_SYSTEM_PLAYREADY,
-  KEY_SYSTEM_WIDEVINE
-};
-
 // Translates a key system string into a CastKeySystem, calling into the
 // platform for known key systems if needed.
 CastKeySystem GetKeySystemByName(const std::string& key_system_name);
 
 // Translates a platform-specific key system string into a CastKeySystem.
 // TODO(gunsch): Remove when prefixed EME is removed.
 CastKeySystem GetPlatformKeySystemByName(const std::string& key_system_name);
 
 // Translates a platform-specific key system string into a CastKeySystem.
 // TODO(gunsch): Remove when prefixed EME is removed.
 #if defined(OS_ANDROID)
 std::vector<::media::MediaClientAndroid::KeySystemUuidMap::value_type>
 GetPlatformKeySystemUUIDMappings();
 #endif
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_BASE_KEY_SYSTEMS_COMMON_H_