Report if video capturing meets output protection requirement.

content/renderer/media/media_stream_video_source.cc

Index: content/renderer/media/media_stream_video_source.cc
diff --git a/content/renderer/media/media_stream_video_source.cc b/content/renderer/media/media_stream_video_source.cc
index a9e93e98dee603c603ab7af58add01e271f47bd2..6118f23bb884a84fc0e607b09a8a2566b121c0a2 100644
--- a/content/renderer/media/media_stream_video_source.cc
+++ b/content/renderer/media/media_stream_video_source.cc
@@ -317,8 +317,8 @@ MediaStreamVideoSource::MediaStreamVideoSource()
     : state_(NEW),
       track_adapter_(
           new VideoTrackAdapter(ChildProcess::current()->io_task_runner())),
-      weak_factory_(this) {
-}
+      secure_tracker_(new CapturingLinkSecureTracker<MediaStreamVideoTrack>()),
+      weak_factory_(this) {}
 
 MediaStreamVideoSource::~MediaStreamVideoSource() {
   DCHECK(CalledOnValidThread());
@@ -333,6 +333,7 @@ void MediaStreamVideoSource::AddTrack(
   DCHECK(!constraints.isNull());
   DCHECK(std::find(tracks_.begin(), tracks_.end(), track) == tracks_.end());
   tracks_.push_back(track);
+  secure_tracker_->AddLinkSecure(track, true);
 
   track_descriptors_.push_back(
       TrackDescriptor(track, frame_callback, constraints, callback));
@@ -383,6 +384,7 @@ void MediaStreamVideoSource::RemoveTrack(MediaStreamVideoTrack* video_track) {
       std::find(tracks_.begin(), tracks_.end(), video_track);
   DCHECK(it != tracks_.end());
   tracks_.erase(it);
+  secure_tracker_->RemoveLinkSecure(video_track);
 
   for (std::vector<TrackDescriptor>::iterator it = track_descriptors_.begin();
        it != track_descriptors_.end(); ++it) {
@@ -400,6 +402,13 @@ void MediaStreamVideoSource::RemoveTrack(MediaStreamVideoTrack* video_track) {
     StopSource();
 }
 
+void MediaStreamVideoSource::UpdateCapturingLinkSecure(
+    MediaStreamVideoTrack* track,
+    bool is_secure) {
+  secure_tracker_->UpdateLinkSecure(track, is_secure);
+  SetCapturingLinkSecured(secure_tracker_->is_capturing_secure());
+}
+
 base::SingleThreadTaskRunner* MediaStreamVideoSource::io_task_runner() const {
   DCHECK(CalledOnValidThread());
   return track_adapter_->io_task_runner();