Let getSettings() return the constrained track resolution, not source.

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..72ead10c4432aff5810f0db957e27d65d73cc425 100644
--- a/content/renderer/media/media_stream_video_track.h
+++ b/content/renderer/media/media_stream_video_track.h
@@ -61,6 +61,13 @@ class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
 
   const blink::WebMediaConstraints& constraints() const { return constraints_; }
 
+  // Setting information about the track size.
+  // Called from MediaStreamVideoSource at track initialization.
+  void SetTargetSize(int width, int height) {
+    width_ = width;
+    height_ = height;
+  }
+
  private:
   // MediaStreamVideoSink is a friend to allow it to call AddSink() and
   // RemoveSink().
@@ -95,6 +102,10 @@ class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
   // This is used for tracking if all connected video sinks are secure.
   SecureDisplayLinkTracker<MediaStreamVideoSink> secure_tracker_;
 
+  // Remembering our desired video size.
+  int width_ = 0;
+  int height_ = 0;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrack);
 };