Implement checks for distinctiveIdentifier and persistentState in requestMediaKeySystemAccess().

media/base/key_system_info.h

Index: media/base/key_system_info.h
diff --git a/media/base/key_system_info.h b/media/base/key_system_info.h
index e259c00d855c755b397784e6662e8e88800dc7e6..e66d8be83880481883ac909419d972c618546ba5 100644
--- a/media/base/key_system_info.h
+++ b/media/base/key_system_info.h
@@ -30,7 +30,7 @@ namespace media {
 // Contains information about an EME key system as well as how to instantiate
 // the corresponding CDM.
 struct MEDIA_EXPORT KeySystemInfo {
-  explicit KeySystemInfo(const std::string& key_system);
+  KeySystemInfo();
   ~KeySystemInfo();
 
   std::string key_system;
@@ -41,6 +41,12 @@ struct MEDIA_EXPORT KeySystemInfo {
   // Specifies codecs supported by |key_system|.
   SupportedCodecs supported_codecs;
 
+  // Specifies session types and features supported by |key_system|.
+  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.