MediaStreamVideoSource exports current video format

content/public/renderer/media_stream_track_api.h

+// 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.
+
+#ifndef CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_TRACK_API_H_
+#define CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_TRACK_API_H_
+
+#include "content/common/content_export.h"
+#include "media/base/video_capture_types.h"
+
+namespace blink {
+class WebMediaStreamTrack;
+}
+
+namespace content {
+
+// On success returns pointer to the current format of the given video track;
+// returns nullptr on failure (if the argument is invalid or if the format
+// cannot be retrieved at the moment).
+CONTENT_EXPORT const media::VideoCaptureFormat* GetCurrentVideoTrackFormat(

[miu, 2016/03/12 01:23:14]

Maybe this function should go in content/public/renderer/media_stream_api.h/.cc?

(Also, note this change is renaming the file, so there might be clashing if you
make changes to it: https://codereview.chromium.org/1773273007/)

+    const blink::WebMediaStreamTrack& video_track);
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_RENDERER_MEDIA_STREAM_TRACK_API_H_