Implement timing frames.

webrtc/modules/video_coding/video_codec_initializer.cc

Index: webrtc/modules/video_coding/video_codec_initializer.cc
diff --git a/webrtc/modules/video_coding/video_codec_initializer.cc b/webrtc/modules/video_coding/video_codec_initializer.cc
index 6e0b806bc8b466ff4d9afeab91a38515ea1cb15c..d29cb442177763ac93573f8ec179251d6269dff8 100644
--- a/webrtc/modules/video_coding/video_codec_initializer.cc
+++ b/webrtc/modules/video_coding/video_codec_initializer.cc
@@ -17,6 +17,7 @@
 #include "webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h"
 #include "webrtc/modules/video_coding/codecs/vp8/simulcast_rate_allocator.h"
 #include "webrtc/modules/video_coding/codecs/vp8/temporal_layers.h"
+#include "webrtc/modules/video_coding/include/video_coding_defines.h"
 #include "webrtc/modules/video_coding/utility/default_video_bitrate_allocator.h"
 #include "webrtc/system_wrappers/include/clock.h"
 
@@ -165,6 +166,10 @@ VideoCodec VideoCodecInitializer::VideoEncoderConfigToVideoCodec(
   video_codec.minBitrate = streams[0].min_bitrate_bps / 1000;
   if (video_codec.minBitrate < kEncoderMinBitrateKbps)
     video_codec.minBitrate = kEncoderMinBitrateKbps;
+  video_codec.timingFrameTriggerThresholds = {
+      kDefaultTimingFramesDelayMs,
+      kDefaultOutlierFrameSizePercent
+  };
   RTC_DCHECK_LE(streams.size(), kMaxSimulcastStreams);
   if (video_codec.codecType == kVideoCodecVP9) {
     // If the vector is empty, bitrates will be configured automatically.