MediaStreamVideoSource exports current video format

content/public/renderer/media_stream_api.cc

Index: content/public/renderer/media_stream_api.cc
diff --git a/content/public/renderer/media_stream_api.cc b/content/public/renderer/media_stream_api.cc
index 5baaa5421d006e32fa70cfcec86eb1138bdfaa3f..a1cc697030db8e5dd9b287a97630a92a6f419997 100644
--- a/content/public/renderer/media_stream_api.cc
+++ b/content/public/renderer/media_stream_api.cc
@@ -13,6 +13,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "content/renderer/media/media_stream_audio_source.h"
 #include "content/renderer/media/media_stream_video_capturer_source.h"
+#include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/media_stream_video_track.h"
 #include "content/renderer/render_thread_impl.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
@@ -112,4 +113,17 @@ bool AddAudioTrackToMediaStream(
   return true;
 }
 
+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