Media Capture Depth Stream Extensions API: videoKind settings and constraint.

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 364a64e73525ae6006a88c478576982ed0a153c5..2327ee8340c0109811b339e02c011e4e15a0402e 100644
--- a/content/renderer/media/media_stream_video_track.h
+++ b/content/renderer/media/media_stream_video_track.h
@@ -16,9 +16,16 @@
 #include "content/renderer/media/media_stream_track.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/secure_display_link_tracker.h"
+#include "media/capture/video_capture_types.h"
+#include "third_party/WebKit/public/platform/WebString.h"
 
 namespace content {
 
+// Calculates and returns videoKind value for |format|.
+// See https://w3c.github.io/mediacapture-depth.
+blink::WebString CONTENT_EXPORT
+GetVideoKindForFormat(const media::VideoCaptureFormat& format);
+
 // MediaStreamVideoTrack is a video specific representation of a
 // blink::WebMediaStreamTrack in content. It is owned by the blink object
 // and can be retrieved from a blink object using