MediaStream should fire ended event when all tracks are ended

Source/WebCore/Modules/mediastream/MediaStreamTrack.h

Index: Source/WebCore/Modules/mediastream/MediaStreamTrack.h
diff --git a/Source/WebCore/Modules/mediastream/MediaStreamTrack.h b/Source/WebCore/Modules/mediastream/MediaStreamTrack.h
index e7fd13e65b2f6752d6eb175cce5478c1070374be..a7959621653548a9c2adeb7d9469dd893e06c75f 100644
--- a/Source/WebCore/Modules/mediastream/MediaStreamTrack.h
+++ b/Source/WebCore/Modules/mediastream/MediaStreamTrack.h
@@ -39,11 +39,12 @@
 
 namespace WebCore {
 
+class MediaStream;
 class MediaStreamComponent;
 
 class MediaStreamTrack : public RefCounted<MediaStreamTrack>, public ActiveDOMObject, public EventTarget, public MediaStreamSource::Observer {
 public:
-    static PassRefPtr<MediaStreamTrack> create(ScriptExecutionContext*, MediaStreamComponent*);
+    static PassRefPtr<MediaStreamTrack> create(ScriptExecutionContext*, MediaStreamComponent*, MediaStream*);
     virtual ~MediaStreamTrack();
 
     String kind() const;
@@ -53,6 +54,8 @@ public:
     bool enabled() const;
     void setEnabled(bool);
 
+    void clearStream() { m_stream = 0; }
+
     String readyState() const;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(mute);
@@ -73,7 +76,7 @@ public:
     using RefCounted<MediaStreamTrack>::deref;
 
 private:
-    MediaStreamTrack(ScriptExecutionContext*, MediaStreamComponent*);
+    MediaStreamTrack(ScriptExecutionContext*, MediaStreamComponent*, MediaStream*);
 
     // EventTarget
     virtual EventTargetData* eventTargetData() OVERRIDE;
@@ -87,6 +90,7 @@ private:
 
     bool m_stopped;
     RefPtr<MediaStreamComponent> m_component;
+    MediaStream* m_stream;
 };
 
 typedef Vector<RefPtr<MediaStreamTrack> > MediaStreamTrackVector;