Add MediaKeySession.keystatuseschange event

Source/modules/encryptedmedia/MediaKeySession.cpp

Index: Source/modules/encryptedmedia/MediaKeySession.cpp
diff --git a/Source/modules/encryptedmedia/MediaKeySession.cpp b/Source/modules/encryptedmedia/MediaKeySession.cpp
index 4215ba392aa3d2dfdf5985afa6177cb3b636017f..e2a9736cdc20983c71737497ec9b9601692f14a3 100644
--- a/Source/modules/encryptedmedia/MediaKeySession.cpp
+++ b/Source/modules/encryptedmedia/MediaKeySession.cpp
@@ -47,6 +47,7 @@
 #include "public/platform/WebContentDecryptionModule.h"
 #include "public/platform/WebContentDecryptionModuleException.h"
 #include "public/platform/WebContentDecryptionModuleSession.h"
+#include "public/platform/WebEncryptedMediaKeyInformation.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 #include "wtf/ASCIICType.h"
@@ -855,6 +856,21 @@ void MediaKeySession::expirationChanged(double updatedExpiryTimeInMS)
     m_expiration = updatedExpiryTimeInMS;
 }
 
+void MediaKeySession::keysStatusesChange(const WebVector<WebEncryptedMediaKeyInformation>& keys, bool hasAdditionalUsableKey)
+{
+    WTF_LOG(Media, "MediaKeySession(%p)::keysChange with %zu keys and usable key: %d", this, keys.size(), hasAdditionalUsableKey);
+
+    RefPtrWillBeRawPtr<Event> event = Event::create(EventTypeNames::keystatuseschange);
+    event->setTarget(this);
+    m_asyncEventQueue->enqueueEvent(event.release());
+
+    // FIXME: Attempt to resume playback if |hasAdditionalUsableKey| is true.
+    // http://crbug.com/413413
+
+    // FIXME: Copy |keys| or whatever is necessary for the keyStatuses attribute.
+    // http://crbug.com/432671
+}
+
 const AtomicString& MediaKeySession::interfaceName() const
 {
     return EventTargetNames::MediaKeySession;