Filter supported session types in createSession().

Source/modules/encryptedmedia/MediaKeys.h

Index: Source/modules/encryptedmedia/MediaKeys.h
diff --git a/Source/modules/encryptedmedia/MediaKeys.h b/Source/modules/encryptedmedia/MediaKeys.h
index a7b817d0cb2783ef1de2d2f52036823afa7eacb2..ddbf5272ebf3c3a433da4ee56532ee70339748fa 100644
--- a/Source/modules/encryptedmedia/MediaKeys.h
+++ b/Source/modules/encryptedmedia/MediaKeys.h
@@ -31,6 +31,7 @@
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/DOMArrayPiece.h"
 #include "platform/Timer.h"
+#include "public/platform/WebMediaKeySystemConfiguration.h"
 #include "wtf/Forward.h"
 #include "wtf/text/WTFString.h"
 
@@ -48,7 +49,7 @@ class MediaKeys : public GarbageCollectedFinalized<MediaKeys>, public ContextLif
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaKeys);
     DEFINE_WRAPPERTYPEINFO();
 public:
-    MediaKeys(ExecutionContext*, const String& keySystem, PassOwnPtr<WebContentDecryptionModule>);
+    MediaKeys(ExecutionContext*, const String& keySystem, const blink::WebMediaKeySystemConfiguration&, PassOwnPtr<WebContentDecryptionModule>);
     virtual ~MediaKeys();
 
     // FIXME: This should be removed after crbug.com/425186 is fully
@@ -72,6 +73,7 @@ private:
     void timerFired(Timer<MediaKeys>*);
 
     const String m_keySystem;
+    const blink::WebMediaKeySystemConfiguration m_configuration;
     OwnPtr<blink::WebContentDecryptionModule> m_cdm;
 
     HeapDeque<Member<PendingAction>> m_pendingActions;