Move sent key frame stats to send_statistics_proxy class.

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 a95ade5d83cbd45abbf8bf700a4a04d410330373..7316ee83625f6f035297d74d8b87bee8e1bc2ad8 100644
--- a/webrtc/video/send_statistics_proxy.cc
+++ b/webrtc/video/send_statistics_proxy.cc
@@ -64,6 +64,12 @@ void SendStatisticsProxy::UpdateHistograms() {
   int encode_ms = encode_time_counter_.Avg(kMinRequiredSamples);
   if (encode_ms != -1)
     RTC_HISTOGRAM_COUNTS_1000("WebRTC.Video.EncodeTimeInMs", encode_ms);
+
+  int key_frames_permille = key_frame_counter_.Permille(kMinRequiredSamples);
+  if (key_frames_permille != -1) {
+    RTC_HISTOGRAM_COUNTS_1000("WebRTC.Video.KeyFramesSentInPermille",
+        key_frames_permille);
+  }
 }
 
 void SendStatisticsProxy::OnOutgoingRate(uint32_t framerate, uint32_t bitrate) {
@@ -162,6 +168,9 @@ void SendStatisticsProxy::OnSendEncodedImage(
   stats->height = encoded_image._encodedHeight;
   update_times_[ssrc].resolution_update_ms = clock_->TimeInMilliseconds();
 
+  if (encoded_image._frameType != kSkipFrame)
+    key_frame_counter_.Add(encoded_image._frameType == kKeyFrame);
+
   // TODO(asapersson): This is incorrect if simulcast layers are encoded on
   // different threads and there is no guarantee that one frame of all layers
   // are encoded before the next start.
@@ -273,4 +282,27 @@ int SendStatisticsProxy::SampleCounter::Avg(int min_required_samples) const {
   return sum / num_samples;
 }
 
+void SendStatisticsProxy::BoolSampleCounter::Add(bool sample) {
+  if (sample)
+    ++sum;
+  ++num_samples;
+}
+
+int SendStatisticsProxy::BoolSampleCounter::Percent(
+    int min_required_samples) const {
+  return Fraction(min_required_samples, 100.0f);
+}
+
+int SendStatisticsProxy::BoolSampleCounter::Permille(
+    int min_required_samples) const {
+  return Fraction(min_required_samples, 1000.0f);
+}
+
+int SendStatisticsProxy::BoolSampleCounter::Fraction(
+    int min_required_samples, float multiplier) const {
+  if (num_samples < min_required_samples || num_samples == 0)
+    return -1;
+  return static_cast<int>((sum * multiplier / num_samples) + 0.5f);
+}
+
 }  // namespace webrtc