Adding owner access from WebMediaStreamTrack::ExtraData

public/platform/WebMediaStreamTrack.h

Index: public/platform/WebMediaStreamTrack.h
diff --git a/public/platform/WebMediaStreamTrack.h b/public/platform/WebMediaStreamTrack.h
index 598bf88e341387c76fc85450c5808f9ce3401453..1760a6bbe1d231533133839b28dccbcce72e3b27 100644
--- a/public/platform/WebMediaStreamTrack.h
+++ b/public/platform/WebMediaStreamTrack.h
@@ -44,6 +44,14 @@ public:
     class ExtraData {
     public:
         virtual ~ExtraData() { }
+        BLINK_EXPORT WebMediaStreamTrack owner();
+
+#if INSIDE_BLINK
+        BLINK_EXPORT void setOwner(WebCore::MediaStreamComponent*);
+#endif
+
+    private:
+        WebCore::MediaStreamComponent* m_owner;
     };
 
     WebMediaStreamTrack() { }