Report if video capturing meets output protection requirement.

content/renderer/media/media_stream_video_track.h

Index: content/renderer/media/media_stream_video_track.h
diff --git a/content/renderer/media/media_stream_video_track.h b/content/renderer/media/media_stream_video_track.h
index 9769d3bb7f13f3749fa11f354917da9596a7dbc4..25ae2017b7acd60fd278b4091806a36fd218a2e4 100644
--- a/content/renderer/media/media_stream_video_track.h
+++ b/content/renderer/media/media_stream_video_track.h
@@ -53,6 +53,8 @@ class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
   void SetEnabled(bool enabled) override;
   void Stop() override;
 
+  void SetVideoSinkSecured(bool is_secure);

[miu, 2016/04/16 00:05:29]

Instead of this separate method, could this bool be passed as an arg to
AddSink()?

[xjz, 2016/04/21 23:50:45]

Done.

+
   void OnReadyStateChanged(blink::WebMediaStreamSource::ReadyState state);
 
   const blink::WebMediaConstraints& constraints() const { return constraints_; }
@@ -89,6 +91,9 @@ class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
   // track.
   MediaStreamVideoSource* source_;
 
+  // Video capturing link is secure if all connected video sink are secure.
+  bool video_capturing_link_secured_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrack);
 };