Plumb frame rate configuration into Cast Streaming API.

media/cast/sender/video_sender.cc

Index: media/cast/sender/video_sender.cc
diff --git a/media/cast/sender/video_sender.cc b/media/cast/sender/video_sender.cc
index 598e0d3a98906e7234d0fba149a165522df5caf0..18579f5f44788158cdc6b6d2e2ac647fd2bf525b 100644
--- a/media/cast/sender/video_sender.cc
+++ b/media/cast/sender/video_sender.cc
@@ -51,7 +51,10 @@ VideoSender::VideoSender(
                           max_unacked_frames_),
       cast_initialization_status_(STATUS_VIDEO_UNINITIALIZED),
       weak_factory_(this) {
-  VLOG(1) << "max_unacked_frames " << max_unacked_frames_;
+  VLOG(1) << "max_unacked_frames is " << max_unacked_frames_
+          << " for target_playout_delay="
+          << target_playout_delay_.InMilliseconds() << " ms"
+          << " and max_frame_rate=" << video_config.max_frame_rate;
   DCHECK_GT(max_unacked_frames_, 0);
 
   if (video_config.use_external_encoder) {