Implement HTMLMediaElement::srcObject.

Source/core/html/HTMLMediaElement.h

Index: Source/core/html/HTMLMediaElement.h
diff --git a/Source/core/html/HTMLMediaElement.h b/Source/core/html/HTMLMediaElement.h
index e1706610fe53f2519267eaa2daa3379d166dd87a..1f4ee72d6f9dc2d7396a38d3c7488f4e52c3c522 100644
--- a/Source/core/html/HTMLMediaElement.h
+++ b/Source/core/html/HTMLMediaElement.h
@@ -59,6 +59,7 @@ class HTMLTrackElement;
 class KURL;
 class MediaController;
 class MediaControls;
+class MediaProvider;
 class MediaError;
 class HTMLMediaSource;
 class TextTrackList;
@@ -111,6 +112,8 @@ public:
 
     // network state
     void setSrc(const AtomicString&);
+    MediaProvider* srcObject() const;
+    void setSrcObject(MediaProvider*);
     const KURL& currentSrc() const { return m_currentSrc; }
 
     enum NetworkState { NETWORK_EMPTY, NETWORK_IDLE, NETWORK_LOADING, NETWORK_NO_SOURCE };
@@ -384,11 +387,14 @@ private:
     void prepareForLoad();
     void loadInternal();
     void selectMediaResource();
+    void loadResource(const KURL&);
     void loadResource(const KURL&, ContentType&, const String& keySystem);
     void startPlayerLoad();
     void setPlayerPreload();
     blink::WebMediaPlayer::LoadType loadType() const;
     void scheduleNextSourceChild();
+    void loadFromObject();
+    void loadFromAttribute();
     void loadNextSourceChild();
     void userCancelledLoad();
     void clearMediaPlayer(int flags);
@@ -506,8 +512,9 @@ private:
     double m_defaultPlaybackStartPosition;
 
     // Loading state.
-    enum LoadState { WaitingForSource, LoadingFromSrcAttr, LoadingFromSourceElement };
+    enum LoadState { WaitingForSource, LoadingFromSrcObject, LoadingFromSrcAttr, LoadingFromSourceElement };
     LoadState m_loadState;
+    RawPtrWillBeMember<MediaProvider> m_srcObject;
     RefPtrWillBeMember<HTMLSourceElement> m_currentSourceNode;
     RefPtrWillBeMember<Node> m_nextChildNodeToConsider;