Add stats for rendered pixels (sqrt(w*h)) per second:

webrtc/video/receive_statistics_proxy.cc

Index: webrtc/video/receive_statistics_proxy.cc
diff --git a/webrtc/video/receive_statistics_proxy.cc b/webrtc/video/receive_statistics_proxy.cc
index b6063a80afbb1719b2c013a0881a52910da3a38d..1147ef245b83d7c2924ddb2706580635b4e60eee 100644
--- a/webrtc/video/receive_statistics_proxy.cc
+++ b/webrtc/video/receive_statistics_proxy.cc
@@ -21,7 +21,8 @@ ReceiveStatisticsProxy::ReceiveStatisticsProxy(uint32_t ssrc, Clock* clock)
       // 1000ms window, scale 1000 for ms to s.
       decode_fps_estimator_(1000, 1000),
       renders_fps_estimator_(1000, 1000),
-      render_fps_tracker_(100u, 10u) {
+      render_fps_tracker_(100u, 10u),
+      render_pixel_tracker_(100u, 10u) {
   stats_.ssrc = ssrc;
 }
 
@@ -40,6 +41,12 @@ void ReceiveStatisticsProxy::UpdateHistograms() {
   if (render_fps > 0)
     RTC_HISTOGRAM_COUNTS_100("WebRTC.Video.RenderFramesPerSecond", render_fps);
 
+  int render_pps = static_cast<int>(render_pixel_tracker_.ComputeTotalRate());
+  if (render_pps > 0) {
+    RTC_HISTOGRAM_COUNTS_100000("WebRTC.Video.RenderPixelsPerSecond",
+                                render_pps);
+  }
+
   const int kMinRequiredSamples = 200;
   int width = render_width_counter_.Avg(kMinRequiredSamples);
   int height = render_height_counter_.Avg(kMinRequiredSamples);
@@ -146,6 +153,8 @@ void ReceiveStatisticsProxy::OnRenderedFrame(int width, int height) {
   render_width_counter_.Add(width);
   render_height_counter_.Add(height);
   render_fps_tracker_.AddSamples(1);
+  if (width > 0 && height > 0)

[pbos-webrtc, 2015/09/23 13:39:20]

DCHECK width>0 and height>0 instead.

[åsapersson, 2015/09/23 14:07:53]

Done.

+    render_pixel_tracker_.AddSamples(sqrt(width * height));
 }
 
 void ReceiveStatisticsProxy::OnReceiveRatesUpdated(uint32_t bitRate,