Record RTT prediction accuracy when using average algorithms

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 86869a435ce1fb5ee9a688b389ca56f5a3779b27..375b2fd516f0ce1b15d242502c3dc0dea313e7d5 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -41674,6 +41674,56 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NQE.UnweightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff"
+    units="ms">
+  <owner>tbansal@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    Records the difference between the estimated HTTP RTT and the observed HTTP
+    RTT. HTTP RTT estimated by the network quality estimator at the time of
+    navigation start is compared with the HTTP RTT observed during the specified
+    time interval following the start of the navigation. Both the estimated and
+    the observed RTT are computed using average algorithm that assigns equal
+    weight to all observations.
+  </summary>
+</histogram>
+
+<histogram name="NQE.UnweightedAverage.MainFrame.RTT" units="ms">
+  <owner>bengr@chromium.org</owner>
+  <owner>tbansal@chromium.org</owner>
+  <summary>
+    Rough estimate of the computed round trip time at the URLRequest layer
+    computed using average algorithm that assigns equal weight to all
+    observations.
+
+    This metric is recorded on main-frame requests.
+  </summary>
+</histogram>
+
+<histogram name="NQE.WeightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff"
+    units="ms">
+  <owner>tbansal@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    Records the difference between the estimated HTTP RTT and the observed HTTP
+    RTT. HTTP RTT estimated by the network quality estimator at the time of
+    navigation start is compared with the HTTP RTT observed during the specified
+    time interval following the start of the navigation. Both the estimated and
+    the observed RTT are computed using weighted average algorithm.
+  </summary>
+</histogram>
+
+<histogram name="NQE.WeightedAverage.MainFrame.RTT" units="ms">
+  <owner>bengr@chromium.org</owner>
+  <owner>tbansal@chromium.org</owner>
+  <summary>
+    Rough estimate of the computed round trip time at the URLRequest layer
+    computed using weighted average algorithm.
+
+    This metric is recorded on main-frame requests.
+  </summary>
+</histogram>
+
 <histogram name="ntp.searchurls.total">
   <obsolete>
     Deprecated 04/2016 as doesn't have data nor owner.
@@ -116881,6 +116931,10 @@ value.
   <affected-histogram name="NQE.Accuracy.TransportRTT.EstimatedObservedDiff"/>
   <affected-histogram
       name="NQE.ExternalEstimateProvider.RTT.Accuracy.EstimatedObservedDiff"/>
+  <affected-histogram
+      name="NQE.UnweightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff"/>
+  <affected-histogram
+      name="NQE.WeightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff"/>
 </histogram_suffixes>
 
 <histogram_suffixes name="NQE.Accuracy.Metric.AccuracyRecordingIntervals"
@@ -116919,6 +116973,14 @@ value.
       name="NQE.ExternalEstimateProvider.RTT.Accuracy.EstimatedObservedDiff.Negative"/>
   <affected-histogram
       name="NQE.ExternalEstimateProvider.RTT.Accuracy.EstimatedObservedDiff.Positive"/>
+  <affected-histogram
+      name="NQE.UnweightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff.Negative"/>
+  <affected-histogram
+      name="NQE.UnweightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff.Positive"/>
+  <affected-histogram
+      name="NQE.WeightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff.Negative"/>
+  <affected-histogram
+      name="NQE.WeightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff.Positive"/>
 </histogram_suffixes>
 
 <histogram_suffixes
@@ -117095,6 +117157,14 @@ value.
       Deprecated 01/2017.
     </obsolete>
   </affected-histogram>
+  <affected-histogram
+      name="NQE.UnweightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff.Negative.15"/>
+  <affected-histogram
+      name="NQE.UnweightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff.Positive.15"/>
+  <affected-histogram
+      name="NQE.WeightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff.Negative.15"/>
+  <affected-histogram
+      name="NQE.WeightedAverage.Accuracy.HttpRTT.EstimatedObservedDiff.Positive.15"/>
 </histogram_suffixes>
 
 <histogram_suffixes name="NQE.DifferentPercentiles" separator=".">