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..3f39d423e2b47ffdb66ef15dc5a64e0fb0ec60b1 100644
--- a/content/renderer/media/media_stream_video_track.h
+++ b/content/renderer/media/media_stream_video_track.h
@@ -13,6 +13,7 @@
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
 #include "content/public/renderer/media_stream_video_sink.h"
+#include "content/renderer/media/capturing_link_secure_tracker.h"
 #include "content/renderer/media/media_stream_track.h"
 #include "content/renderer/media/media_stream_video_source.h"
 
@@ -72,7 +73,8 @@ class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
   // store the callback. This is important to ensure that we can release
   // the callback on render thread without reference to it on the IO-thread.
   void AddSink(MediaStreamVideoSink* sink,
-               const VideoCaptureDeliverFrameCB& callback);
+               const VideoCaptureDeliverFrameCB& callback,
+               bool is_sink_secure);
   void RemoveSink(MediaStreamVideoSink* sink);
 
   std::vector<MediaStreamVideoSink*> sinks_;
@@ -89,6 +91,10 @@ class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
   // track.
   MediaStreamVideoSource* source_;
 
+  // This is used for tracking if all connected video sinks are secure.
+  std::unique_ptr<CapturingLinkSecureTracker<MediaStreamVideoSink>>

[miu, 2016/04/26 01:25:14]

ditto: Extra indirection unnecessary here.

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

Done.

+      secure_tracker_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrack);
 };