Add sent framerates to histogram stats:

webrtc/video/send_statistics_proxy.cc

Index: webrtc/video/send_statistics_proxy.cc
diff --git a/webrtc/video/send_statistics_proxy.cc b/webrtc/video/send_statistics_proxy.cc
index a6cb5b38e6bddd3d312f8c9b3d455acee9103cf6..c5e9bef6abf76312a9816ce06e6d419722a505d9 100644
--- a/webrtc/video/send_statistics_proxy.cc
+++ b/webrtc/video/send_statistics_proxy.cc
@@ -16,6 +16,7 @@
 
 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
 #include "webrtc/system_wrappers/interface/logging.h"
+#include "webrtc/system_wrappers/interface/metrics.h"
 
 namespace webrtc {
 
@@ -27,7 +28,20 @@ SendStatisticsProxy::SendStatisticsProxy(Clock* clock,
       config_(config) {
 }
 
-SendStatisticsProxy::~SendStatisticsProxy() {}
+SendStatisticsProxy::~SendStatisticsProxy() {
+  UpdateHistograms();
+}
+
+void SendStatisticsProxy::UpdateHistograms() {
+  int fps;
+  {
+    rtc::CritScope lock(&crit_);
+    fps = static_cast<int>(input_frame_rate_tracker_total_.units_second());
+  }
+  if (fps > 0) {
+    RTC_HISTOGRAM_COUNTS_100("WebRTC.Video.InputFramesPerSecond", fps);
+  }
+}
 
 void SendStatisticsProxy::OutgoingRate(const int video_channel,
                                        const unsigned int framerate,
@@ -130,6 +144,7 @@ void SendStatisticsProxy::OnSendEncodedImage(
 void SendStatisticsProxy::OnIncomingFrame() {
   rtc::CritScope lock(&crit_);
   input_frame_rate_tracker_.Update(1);
+  input_frame_rate_tracker_total_.Update(1);
 }
 
 void SendStatisticsProxy::RtcpPacketTypesCounterUpdated(