Sync the HTMLM*Element interfaces with the spec

Source/core/html/HTMLMediaElement.idl

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+// https://html.spec.whatwg.org/#htmlmediaelement
+
+enum CanPlayTypeResult { "" /* empty string */, "maybe", "probably" };
 [
     ActiveDOMObject,
     RuntimeEnabled=Media,
 ] interface HTMLMediaElement : HTMLElement {
 
     // error state
     readonly attribute MediaError? error;
 
     // network state
     [Reflect, URL] attribute DOMString src;
-    [URL] readonly attribute DOMString currentSrc;
+    // FIXME: attribute MediaProvider? srcObject; crbug.com/387740
+    readonly attribute DOMString currentSrc;
     [Reflect, ReflectOnly=("anonymous","use-credentials"), ReflectEmpty="anonymous", ReflectInvalid="anonymous"] attribute DOMString? crossOrigin;
-
     const unsigned short NETWORK_EMPTY = 0;
     const unsigned short NETWORK_IDLE = 1;
     const unsigned short NETWORK_LOADING = 2;
     const unsigned short NETWORK_NO_SOURCE = 3;
     readonly attribute unsigned short networkState;
     attribute DOMString preload;
-
     readonly attribute TimeRanges buffered;
     void load();
-    DOMString canPlayType(DOMString type);
-    [RuntimeEnabled=PrefixedEncryptedMedia, DeprecateAs=CanPlayTypeKeySystem] DOMString canPlayType(DOMString type, [TreatUndefinedAs=NullString] DOMString? keySystem);
+    CanPlayTypeResult canPlayType(DOMString type);
 
     // ready state
     const unsigned short HAVE_NOTHING = 0;
     const unsigned short HAVE_METADATA = 1;
     const unsigned short HAVE_CURRENT_DATA = 2;
     const unsigned short HAVE_FUTURE_DATA = 3;
     const unsigned short HAVE_ENOUGH_DATA = 4;
     readonly attribute unsigned short readyState;
     readonly attribute boolean seeking;
 
     // playback state
     [RaisesException=Setter] attribute double currentTime;
+    // FIXME: void fastSeek(double time);
     readonly attribute unrestricted double duration;
+    // FIXME: Date getStartDate(); crbug.com/312699
     readonly attribute boolean paused;
     attribute double defaultPlaybackRate;
     attribute double playbackRate;
     readonly attribute TimeRanges played;
     readonly attribute TimeRanges seekable;
     readonly attribute boolean ended;
     [Reflect] attribute boolean autoplay;
     [Reflect] attribute boolean loop;
     void play();
     void pause();
 
     // media controller
     [RuntimeEnabled=MediaController, Reflect] attribute DOMString mediaGroup;
     [RuntimeEnabled=MediaController, TypeChecking=Interface] attribute MediaController? controller;
 
     // controls
     [Reflect] attribute boolean controls;
     [RaisesException=Setter] attribute double volume;
     attribute boolean muted;
     [Reflect=muted] attribute boolean defaultMuted;
 
     // tracks
-    [RuntimeEnabled=AudioVideoTracks] readonly attribute AudioTrackList audioTracks;
-    [RuntimeEnabled=AudioVideoTracks] readonly attribute VideoTrackList videoTracks;
-    readonly attribute TextTrackList textTracks;
+    [SameObject, RuntimeEnabled=AudioVideoTracks] readonly attribute AudioTrackList audioTracks;
+    [SameObject, RuntimeEnabled=AudioVideoTracks] readonly attribute VideoTrackList videoTracks;
+    [SameObject] readonly attribute TextTrackList textTracks;
     [RaisesException] TextTrack addTextTrack(TextTrackKind kind, optional DOMString label = "", optional DOMString language = "");
 
-    // WebKit extensions
+    // Subresource Integrity
+    // http://w3c.github.io/webappsec/specs/subresourceintegrity/
+    // FIXME: The spec does not extend HTMLAnchorElement.
+    [Reflect, RuntimeEnabled=SubresourceIntegrity] attribute DOMString integrity;
 
+    // Non-standard APIs
+    [RuntimeEnabled=PrefixedEncryptedMedia, DeprecateAs=CanPlayTypeKeySystem] DOMString canPlayType(DOMString type, [TreatUndefinedAs=NullString] DOMString? keySystem);
     // The number of bytes consumed by the media decoder.
     [MeasureAs=PrefixedAudioDecodedByteCount] readonly attribute unsigned long webkitAudioDecodedByteCount;
     [MeasureAs=PrefixedVideoDecodedByteCount] readonly attribute unsigned long webkitVideoDecodedByteCount;
-
-    [Reflect, RuntimeEnabled=SubresourceIntegrity] attribute DOMString integrity;
 };