Periodically update codec bit/frame rate settings.

webrtc/modules/video_coding/video_sender.cc

Index: webrtc/modules/video_coding/video_sender.cc
diff --git a/webrtc/modules/video_coding/video_sender.cc b/webrtc/modules/video_coding/video_sender.cc
index 0b54d13b2901e1bfc7faf03e309a64f4d28a3dd8..50d56206bc2de85392d8462cd23ed68a65f7fb2d 100644
--- a/webrtc/modules/video_coding/video_sender.cc
+++ b/webrtc/modules/video_coding/video_sender.cc
@@ -103,6 +103,11 @@ int32_t VideoSender::RegisterSendCodec(const VideoCodec* sendCodec,
     numLayers = sendCodec->VP8().numberOfTemporalLayers;
   } else if (sendCodec->codecType == kVideoCodecVP9) {
     numLayers = sendCodec->VP9().numberOfTemporalLayers;
+  } else if (sendCodec->codecType == kVideoCodecGeneric &&
+             sendCodec->numberOfSimulcastStreams > 0) {
+    // This is mainly for unit testing, disabling frame dropping.

[stefan-webrtc, 2017/05/23 17:03:20]

I don't see why this disables frame dropping?

[sprang_webrtc, 2017/05/24 09:07:07]

Allows us to set temporal layer count with generic codec, so that screenshare
mode (the only mode with frame dropping disabled) can be enabled.
I know this is kinda ugly, but there was just soo much plumbing needed (in
production code) otherwise, which I didn't feel was worth it to deflakify some
tests...

+    // TODO(sprang): Add a better way to disable frame dropping.
+    numLayers = sendCodec->simulcastStream[0].numberOfTemporalLayers;
   } else {
     numLayers = 1;
   }