Implement HTMLMediaElement::srcObject.

Source/core/html/HTMLMediaElement.idl

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-
 [
     ActiveDOMObject,
     RuntimeEnabled=Media,
     SpecialWrapFor=(HTMLAudioElement,HTMLVideoElement),
     TypeChecking=Unrestricted,
 ] interface HTMLMediaElement : HTMLElement {
 
     // error state
     readonly attribute MediaError? error;
 
     // network state
     [Reflect, URL] attribute DOMString src;
+    // FIXME: should use typedef (MediaStream or MediaSource or Blob) MediaProvider and be attribute MediaProvider? srcObject;
+    // http://crbug.com/240176
+
+    [Custom] attribute object? srcObject;    
     [URL] 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;
 
@@ skipping 41 matching lines @@
     [RaisesException] TextTrack addTextTrack(DOMString kind, optional DOMString label, optional DOMString language);
 
     // WebKit extensions
 
     // 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;
 };