Implement framesEncoded stat in video send ssrc stats.

webrtc/media/engine/webrtcvideoengine2.cc

Index: webrtc/media/engine/webrtcvideoengine2.cc
diff --git a/webrtc/media/engine/webrtcvideoengine2.cc b/webrtc/media/engine/webrtcvideoengine2.cc
index 4e22a487a2fb86324c25aa5cc4b2520f02ff3656..86dd1b085e8841ec162dbab8d2bdc63119558784 100644
--- a/webrtc/media/engine/webrtcvideoengine2.cc
+++ b/webrtc/media/engine/webrtcvideoengine2.cc
@@ -2169,6 +2169,7 @@ VideoSenderInfo WebRtcVideoChannel2::WebRtcVideoSendStream::GetVideoSenderInfo(
   info.framerate_sent = stats.encode_frame_rate;
   info.avg_encode_ms = stats.avg_encode_time_ms;
   info.encode_usage_percent = stats.encode_usage_percent;
+  info.frames_encoded = stats.frames_encoded;
 
   info.nominal_bitrate = stats.media_bitrate_bps;
   info.preferred_bitrate = stats.preferred_media_bitrate_bps;