Reland of Properly report number of quality downscales in 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 82d7f0dc7593bf2cd694aa69d55d8b6e91572915..6c249f70a97629eec33192ace3e11432449f0322 100644
--- a/webrtc/video/send_statistics_proxy.cc
+++ b/webrtc/video/send_statistics_proxy.cc
@@ -506,17 +506,13 @@ void SendStatisticsProxy::OnSendEncodedImage(
   uma_container_->key_frame_counter_.Add(encoded_image._frameType ==
                                          kVideoFrameKey);
   stats_.bw_limited_resolution =
-      stats_.bw_limited_resolution ||
-      encoded_image.adapt_reason_.bw_resolutions_disabled > 0;
-
-  if (encoded_image.adapt_reason_.quality_resolution_downscales != -1) {
-    bool downscaled =
-        encoded_image.adapt_reason_.quality_resolution_downscales > 0;
-    uma_container_->quality_limited_frame_counter_.Add(downscaled);
-    if (downscaled) {
-      uma_container_->quality_downscales_counter_.Add(
-          encoded_image.adapt_reason_.quality_resolution_downscales);
-    }
+      encoded_image.adapt_reason_.bw_resolutions_disabled > 0 ||
+      quality_downscales_ > 0;
+
+  if (quality_downscales_ != -1) {
+    uma_container_->quality_limited_frame_counter_.Add(quality_downscales_ > 0);
+    if (quality_downscales_ > 0)
+      uma_container_->quality_downscales_counter_.Add(quality_downscales_);
   }
   if (encoded_image.adapt_reason_.bw_resolutions_disabled != -1) {
     bool bw_limited = encoded_image.adapt_reason_.bw_resolutions_disabled > 0;
@@ -587,11 +583,20 @@ void SendStatisticsProxy::OnIncomingFrame(int width, int height) {
   uma_container_->cpu_limited_frame_counter_.Add(stats_.cpu_limited_resolution);
 }
 
-void SendStatisticsProxy::SetResolutionRestrictionStats(bool bandwidth,
-                                                        bool cpu) {
+void SendStatisticsProxy::SetResolutionRestrictionStats(
+    bool scaling_enabled,
+    bool cpu_restricted,
+    int num_quality_downscales) {
   rtc::CritScope lock(&crit_);
-  stats_.bw_limited_resolution = bandwidth;
-  stats_.cpu_limited_resolution = cpu;
+  if (scaling_enabled) {
+    quality_downscales_ = num_quality_downscales;
+    stats_.bw_limited_resolution = quality_downscales_ > 0;
+    stats_.cpu_limited_resolution = cpu_restricted;
+  } else {
+    stats_.bw_limited_resolution = false;
+    stats_.cpu_limited_resolution = false;
+    quality_downscales_ = -1;
+  }
 }
 
 void SendStatisticsProxy::OnCpuRestrictedResolutionChanged(
@@ -602,10 +607,10 @@ void SendStatisticsProxy::OnCpuRestrictedResolutionChanged(
 }
 
 void SendStatisticsProxy::OnQualityRestrictedResolutionChanged(
-    bool restricted) {
+    int num_quality_downscales) {
   rtc::CritScope lock(&crit_);
-  uma_container_->quality_downscales_counter_.Add(restricted);
-  stats_.bw_limited_resolution = restricted;
+  quality_downscales_ = num_quality_downscales;
+  stats_.bw_limited_resolution = quality_downscales_ > 0;
 }
 
 void SendStatisticsProxy::RtcpPacketTypesCounterUpdated(