Implement robustness strings in requestMediaKeySystemAccess().

media/base/key_system_info.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_KEY_SYSTEM_INFO_H_
 #define MEDIA_BASE_KEY_SYSTEM_INFO_H_
 
 #include <string>
 
 #include "media/base/eme_constants.h"
@@ skipping 17 matching lines @@
 namespace media {
 
 // Contains information about an EME key system as well as how to instantiate
 // the corresponding CDM.
 struct MEDIA_EXPORT KeySystemInfo {
   KeySystemInfo();
   ~KeySystemInfo();
 
   std::string key_system;
 
-  // Specifies registered initialization data types supported by |key_system|.
   SupportedInitDataTypes supported_init_data_types;
-
-  // Specifies codecs supported by |key_system|.
   SupportedCodecs supported_codecs;
-
-  // Specifies session types and features supported by |key_system|.
+  EmeRobustness max_audio_robustness;
+  EmeRobustness max_video_robustness;
   EmeSessionTypeSupport persistent_license_support;
   EmeSessionTypeSupport persistent_release_message_support;
   EmeFeatureSupport persistent_state_support;
   EmeFeatureSupport distinctive_identifier_support;
 
   // A hierarchical parent for |key_system|. This value can be used to check
   // supported types but cannot be used to instantiate a MediaKeys object.
   // Only one parent key system is currently supported per concrete key system.
   std::string parent_key_system;
 
   // The following indicate how the corresponding CDM should be instantiated.
   bool use_aes_decryptor;
 #if defined(ENABLE_PEPPER_CDMS)
   std::string pepper_type;
 #endif
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_KEY_SYSTEM_INFO_H_