Make HTMLMediaElement.setMediaKeys() asynchronous.

Source/modules/encryptedmedia/HTMLMediaElementEncryptedMedia.h

 // Copyright 2014 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 HTMLMediaElementEncryptedMedia_h
 #define HTMLMediaElementEncryptedMedia_h
 
 #include "modules/EventTargetModules.h"
 #include "platform/Supplementable.h"
 #include "platform/graphics/media/MediaPlayer.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebMediaPlayerClient.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class ExceptionState;
 class HTMLMediaElement;
 class MediaKeys;
+class ScriptPromise;
+class ScriptState;
 
 class HTMLMediaElementEncryptedMedia FINAL : public NoBaseWillBeGarbageCollected<HTMLMediaElementEncryptedMedia>, public WillBeHeapSupplement<HTMLMediaElement> {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElementEncryptedMedia);
     DECLARE_EMPTY_VIRTUAL_DESTRUCTOR_WILL_BE_REMOVED(HTMLMediaElementEncryptedMedia);
 public:
     // encrypted media extensions (v0.1b)
     static void webkitGenerateKeyRequest(HTMLMediaElement&, const String& keySystem, PassRefPtr<Uint8Array> initData, ExceptionState&);
     static void webkitGenerateKeyRequest(HTMLMediaElement&, const String& keySystem, ExceptionState&);
     static void webkitAddKey(HTMLMediaElement&, const String& keySystem, PassRefPtr<Uint8Array> key, PassRefPtr<Uint8Array> initData, const String& sessionId, ExceptionState&);
     static void webkitAddKey(HTMLMediaElement&, const String& keySystem, PassRefPtr<Uint8Array> key, ExceptionState&);
     static void webkitCancelKeyRequest(HTMLMediaElement&, const String& keySystem, const String& sessionId, ExceptionState&);
 
     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitkeyadded);
     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitkeyerror);
     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitkeymessage);
     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(webkitneedkey);
 
     // encrypted media extensions (WD)
     static MediaKeys* mediaKeys(HTMLMediaElement&);
-    static void setMediaKeys(HTMLMediaElement&, MediaKeys*, ExceptionState&);
+    static ScriptPromise setMediaKeys(ScriptState*, HTMLMediaElement&, MediaKeys*);
     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(needkey);
 
     static void keyAdded(HTMLMediaElement&, const String& keySystem, const String& sessionId);
     static void keyError(HTMLMediaElement&, const String& keySystem, const String& sessionId, WebMediaPlayerClient::MediaKeyErrorCode, unsigned short systemCode);
     static void keyMessage(HTMLMediaElement&, const String& keySystem, const String& sessionId, const unsigned char* message, unsigned messageLength, const WebURL& defaultURL);
     static void keyNeeded(HTMLMediaElement&, const String& contentType, const unsigned char* initData, unsigned initDataLength);
     static void playerDestroyed(HTMLMediaElement&);
     static WebContentDecryptionModule* contentDecryptionModule(HTMLMediaElement&);
 
     static HTMLMediaElementEncryptedMedia& from(HTMLMediaElement&);
     static const char* supplementName();
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
+    friend class SetMediaKeysHandler;
+
     HTMLMediaElementEncryptedMedia();
     void generateKeyRequest(WebMediaPlayer*, const String& keySystem, PassRefPtr<Uint8Array> initData, ExceptionState&);
     void addKey(WebMediaPlayer*, const String& keySystem, PassRefPtr<Uint8Array> key, PassRefPtr<Uint8Array> initData, const String& sessionId, ExceptionState&);
     void cancelKeyRequest(WebMediaPlayer*, const String& keySystem, const String& sessionId, ExceptionState&);
 
     // EventTarget
     bool setAttributeEventListener(const AtomicString& eventType, PassRefPtr<EventListener>);
     EventListener* getAttributeEventListener(const AtomicString& eventType);
 
     // Currently we have both EME v0.1b and EME WD implemented in media element.
     // But we do not want to support both at the same time. The one used first
     // will be supported. Use |m_emeMode| to track this selection.
     // FIXME: Remove EmeMode once EME v0.1b support is removed. See crbug.com/249976.
     enum EmeMode { EmeModeNotSelected, EmeModePrefixed, EmeModeUnprefixed };
 
     // check (and set if necessary) the encrypted media extensions (EME) mode
     // (v0.1b or WD). Returns whether the mode is allowed and successfully set.
-    bool setEmeMode(EmeMode, ExceptionState&);
+    bool setEmeMode(EmeMode);
 
     WebContentDecryptionModule* contentDecryptionModule();
-    void setMediaKeysInternal(HTMLMediaElement&, MediaKeys*);
 
     EmeMode m_emeMode;
 
     PersistentWillBeMember<MediaKeys> m_mediaKeys;
 };
 
 } // namespace blink
 
 #endif