Have HTMLMediaElement::play() return a Promise.

third_party/WebKit/Source/core/html/HTMLMediaElement.h

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 #ifndef HTMLMediaElement_h
 #define HTMLMediaElement_h
 
+#include "bindings/core/v8/ScriptPromise.h"
 #include "core/CoreExport.h"
 #include "core/dom/ActiveDOMObject.h"
+#include "core/dom/ExceptionCode.h"
 #include "core/events/GenericEventQueue.h"
 #include "core/html/AutoplayExperimentHelper.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/track/TextTrack.h"
 #include "platform/Supplementable.h"
 #include "platform/audio/AudioSourceProvider.h"
 #include "public/platform/WebAudioSourceProviderClient.h"
 #include "public/platform/WebMediaPlayerClient.h"
 #include "public/platform/WebMimeRegistry.h"
 
 namespace blink {
 
 class AudioSourceProviderClient;
 class AudioTrackList;
 class ContentType;
 class CueTimeline;
 class Event;
 class ExceptionState;
 class HTMLSourceElement;
 class HTMLTrackElement;
 class KURL;
 class MediaControls;
 class MediaError;
 class HTMLMediaSource;
+class ScriptState;
 class TextTrackContainer;
 class TextTrackList;
 class TimeRanges;
 class URLRegistry;
 class VideoTrackList;
 class WebAudioSourceProvider;
 class WebInbandTextTrack;
 class WebLayer;
 
 class CORE_EXPORT HTMLMediaElement : public HTMLElement, public WillBeHeapSupplementable<HTMLMediaElement>, public ActiveDOMObject, private WebMediaPlayerClient {
@@ skipping 68 matching lines @@
     double playbackRate() const;
     void setPlaybackRate(double);
     void updatePlaybackRate();
     TimeRanges* played();
     TimeRanges* seekable() const;
     bool ended() const;
     bool autoplay() const;
     bool shouldAutoplay(const RecordMetricsBehavior = RecordMetricsBehavior::DoNotRecord);
     bool loop() const;
     void setLoop(bool);
-    void play();
+    ScriptPromise playForBindings(ScriptState*);
+    Nullable<ExceptionCode> play();
     void pause();
     void requestRemotePlayback();
     void requestRemotePlaybackControl();
 
     // statistics
     unsigned webkitAudioDecodedByteCount() const;
     unsigned webkitVideoDecodedByteCount() const;
 
     // media source extensions
     void closeMediaSource();
@@ skipping 288 matching lines @@
     void removeUserGestureRequirement();
     void setInitialPlayWithoutUserGestures(bool);
 
     void setNetworkState(NetworkState);
 
     void audioTracksTimerFired(Timer<HTMLMediaElement>*);
 
     // TODO(liberato): remove once autoplay gesture override experiment concludes.
     void triggerAutoplayViewportCheckForTesting();
 
+    void scheduleResolvePlayPromises();
+    void scheduleRejectPlayPromises(ExceptionCode);
+    void scheduleNotifyPlaying();
+
+    void resolvePlayPromises();
+    // TODO(mlamouri): this is used for cancellable tasks because we can't pass
+    // parameters.
+    void rejectPlayPromises();
+    void rejectPlayPromises(ExceptionCode, const String&);
+
     UnthrottledTimer<HTMLMediaElement> m_loadTimer;
     UnthrottledTimer<HTMLMediaElement> m_progressEventTimer;
     UnthrottledTimer<HTMLMediaElement> m_playbackProgressTimer;
     UnthrottledTimer<HTMLMediaElement> m_audioTracksTimer;
     PersistentWillBeMember<TimeRanges> m_playedTimeRanges;
     OwnPtrWillBeMember<GenericEventQueue> m_asyncEventQueue;
 
     double m_playbackRate;
     double m_defaultPlaybackRate;
     NetworkState m_networkState;
@@ skipping 88 matching lines @@
     // Whether this element is in overlay fullscreen mode.
     bool m_inOverlayFullscreenVideo : 1;
 
     PersistentWillBeMember<AudioTrackList> m_audioTracks;
     PersistentWillBeMember<VideoTrackList> m_videoTracks;
     PersistentWillBeMember<TextTrackList> m_textTracks;
     PersistentHeapVectorWillBeHeapVector<Member<TextTrack>> m_textTracksWhenResourceSelectionBegan;
 
     OwnPtrWillBeMember<CueTimeline> m_cueTimeline;
 
+    PersistentHeapVectorWillBeHeapVector<Member<ScriptPromiseResolver>> m_playResolvers;
+    OwnPtr<CancellableTaskFactory> m_playPromiseResolveTask;
+    OwnPtr<CancellableTaskFactory> m_playPromiseRejectTask;
+    ExceptionCode m_playPromiseErrorCode;
+
     // This is a weak reference, since m_audioSourceNode holds a reference to us.
     // FIXME: Oilpan: Consider making this a strongly traced pointer with oilpan where strong cycles are not a problem.
     GC_PLUGIN_IGNORE("http://crbug.com/404577")
     RawPtrWillBeWeakMember<AudioSourceProviderClient> m_audioSourceNode;
 
     // AudioClientImpl wraps an AudioSourceProviderClient.
     // When the audio format is known, Chromium calls setFormat().
     class AudioClientImpl final : public GarbageCollectedFinalized<AudioClientImpl>, public WebAudioSourceProviderClient {
     public:
         explicit AudioClientImpl(AudioSourceProviderClient* client)
@@ skipping 54 matching lines @@
 inline bool isHTMLMediaElement(const HTMLElement& element)
 {
     return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } // namespace blink
 
 #endif // HTMLMediaElement_h