Expose packet loss counts from QUIC to NetworkQualityEstimator

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index d1f6c589c98f2ed52d062650af328089eaa1f7c7..c769ddc9e539872592a020a44a0fd0cc6b0563c1 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -31407,6 +31407,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NQE.PacketLossRate" units="100 times">
+  <owner>bengr@chromium.org</owner>
+  <owner>tbansal@chromium.org</owner>
+  <summary>
+    Estimate of the packet loss rate multiplied by 100.
+
+    This metric is recorded on every main frame request.
+  </summary>
+</histogram>
+
 <histogram name="NQE.PeakKbps" units="Kbps">
   <owner>bengr@chromium.org</owner>
   <owner>tbansal@chromium.org</owner>
@@ -86151,6 +86161,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <affected-histogram name="NQE.DifferenceRTTActualAndEstimated"/>
   <affected-histogram name="NQE.DifferenceRTTEstimatedAndActual"/>
   <affected-histogram name="NQE.FastestRTT"/>
+  <affected-histogram name="NQE.PacketLossRate"/>
   <affected-histogram name="NQE.PeakKbps"/>
   <affected-histogram name="NQE.RatioEstimatedToActualRTT"/>
   <affected-histogram name="NQE.RTT.Percentile0"/>