Report if video capturing meets output protection requirement.

content/public/renderer/media_stream_video_sink.h

Index: content/public/renderer/media_stream_video_sink.h
diff --git a/content/public/renderer/media_stream_video_sink.h b/content/public/renderer/media_stream_video_sink.h
index fd5334c4e6d1fb74929a48d3c025e7d6a9cf0e71..dd0999a3589c168b59070155e1700edd9521e4a3 100644
--- a/content/public/renderer/media_stream_video_sink.h
+++ b/content/public/renderer/media_stream_video_sink.h
@@ -41,8 +41,12 @@ class CONTENT_EXPORT MediaStreamVideoSink : public MediaStreamSink {
   // Warning: Calling DisconnectFromTrack does not immediately stop frame
   // delivery through the |callback|, since frames are being delivered on a
   // different thread.
+  //
+  // |is_sink_secure| indicates if this MediaStreamVideoSink is secure (i.e.
+  // meets output protection requirement).

[miu, 2016/04/26 01:25:13]

nit: Consider adding a cautionary comment like: "Generally, this should be false
unless you know what you are doing."

[xjz, 2016/04/29 00:11:42]

Done.

   void ConnectToTrack(const blink::WebMediaStreamTrack& track,
-                      const VideoCaptureDeliverFrameCB& callback);
+                      const VideoCaptureDeliverFrameCB& callback,
+                      bool is_sink_secure);
   void DisconnectFromTrack();
 
   // Returns the currently-connected track, or a null instance otherwise.