Propagate MediaStreamSource state to video tracks the same way as audio.

webrtc/api/mediastreamtrack.h

Index: webrtc/api/mediastreamtrack.h
diff --git a/webrtc/api/mediastreamtrack.h b/webrtc/api/mediastreamtrack.h
index dcac58128b9146eec7ba94748f6649b9b4c523b3..e6f02e58fbfd87a052ea814707d6b880c057d2d3 100644
--- a/webrtc/api/mediastreamtrack.h
+++ b/webrtc/api/mediastreamtrack.h
@@ -48,10 +48,7 @@ class MediaStreamTrack : public Notifier<T> {
 
  protected:
   explicit MediaStreamTrack(const std::string& id)
-      : enabled_(true),
-        id_(id),
-        state_(MediaStreamTrackInterface::kInitializing) {
-  }
+      : enabled_(true), id_(id), state_(MediaStreamTrackInterface::kLive) {}
 
  private:
   bool enabled_;