MediaStreamVideoSource exports current video format

content/public/renderer/media_stream_track_api.cc

Index: content/public/renderer/media_stream_track_api.cc
diff --git a/content/public/renderer/media_stream_track_api.cc b/content/public/renderer/media_stream_track_api.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fa6d97d773e5e40a4e6d2d76177c6b1f8b2e50dd
--- /dev/null
+++ b/content/public/renderer/media_stream_track_api.cc
@@ -0,0 +1,24 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/public/renderer/media_stream_track_api.h"
+
+#include "content/renderer/media/media_stream_video_source.h"
+
+namespace content {
+
+const media::VideoCaptureFormat* GetCurrentVideoTrackFormat(
+    const blink::WebMediaStreamTrack& video_track) {
+  if (video_track.isNull())
+    return nullptr;
+
+  content::MediaStreamVideoSource* source =
+      content::MediaStreamVideoSource::GetVideoSource(video_track.source());
+  if (!source)
+    return nullptr;
+
+  return source->GetCurrentFormat();
+}
+
+}  // namespace content