Implement robustness strings in requestMediaKeySystemAccess().

media/base/key_systems.h

Index: media/base/key_systems.h
diff --git a/media/base/key_systems.h b/media/base/key_systems.h
index 93317a118fcd117032cd452da44a54fb40e745ba..2ac2175cfd5b2194e34f8d0ae76bc4bc45e822cd 100644
--- a/media/base/key_systems.h
+++ b/media/base/key_systems.h
@@ -85,27 +85,32 @@ MEDIA_EXPORT std::string GetPepperType(
     const std::string& concrete_key_system);
 #endif
 
-// Returns whether |key_system| supports persistent-license sessions.
-MEDIA_EXPORT bool IsPersistentLicenseSessionSupported(
+// Returns the configuration rule for supporting a robustness requirement.
+// TODO(sandersd): Also take a list of codecs, as they may affect the result.
+MEDIA_EXPORT EmeConfigRule GetRobustnessConfigRule(
     const std::string& key_system,
-    bool is_permission_granted);
+    EmeMediaType media_type,
+    const std::string& robustness);
 
-// Returns whether |key_system| supports persistent-release-message sessions.
-MEDIA_EXPORT bool IsPersistentReleaseMessageSessionSupported(
-    const std::string& key_system,
-    bool is_permission_granted);
+// Returns the configuration rule for supporting persistent-license sessions.
+MEDIA_EXPORT EmeConfigRule GetPersistentLicenseSessionConfigRule(
+    const std::string& key_system);
+
+// Returns the configuration rule for supporting persistent-release-message
+// sessions.
+MEDIA_EXPORT EmeConfigRule GetPersistentReleaseMessageSessionConfigRule(
+    const std::string& key_system);
 
-// Returns whether |key_system| supports persistent state as requested.
-MEDIA_EXPORT bool IsPersistentStateRequirementSupported(
+// Returns the configuration rule for supporting a persistent state requirement.
+MEDIA_EXPORT EmeConfigRule GetPersistentStateConfigRule(
     const std::string& key_system,
-    EmeFeatureRequirement requirement,
-    bool is_permission_granted);
+    EmeFeatureRequirement requirement);
 
-// Returns whether |key_system| supports distinctive identifiers as requested.
-MEDIA_EXPORT bool IsDistinctiveIdentifierRequirementSupported(
+// Returns the configuration rule for supporting a distinctive identifier
+// requirement.
+MEDIA_EXPORT EmeConfigRule GetDistinctiveIdentifierConfigRule(
     const std::string& key_system,
-    EmeFeatureRequirement requirement,
-    bool is_permission_granted);
+    EmeFeatureRequirement requirement);
 
 #if defined(UNIT_TEST)
 // Helper functions to add container/codec types for testing purposes.