Record NQE accuracy at main frame requests

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 e27be831c1d97deee5003d779751ae1067c2dc53..fe32b6c07a90a6af4c9a9254cd3d8a4ee446143c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -34484,6 +34484,56 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NQE.Accuracy.HttpRTT.ActualEstimatedDiff" units="ms">
+  <owner>tbansal@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    Records the difference between the observed HTTP RTT and the actual HTTP
+    RTT. HTTP RTT predicted 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. This metric is recorded
+    only when the estimated RTT is lower than the observed RTT.
+  </summary>
+</histogram>
+
+<histogram name="NQE.Accuracy.HttpRTT.EstimatedActualDiff" 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 predicted 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. This metric is recorded
+    only when the estimated RTT is at least as high as observed RTT.
+  </summary>
+</histogram>
+
+<histogram name="NQE.Accuracy.TransportRTT.ActualEstimatedDiff" units="ms">
+  <owner>tbansal@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    Records the difference between the observed transport RTT and the actual
+    transport RTT. Transport RTT predicted by the network quality estimator at
+    the time of navigation start is compared with the transport RTT observed
+    during the specified time interval following the start of the navigation.
+    This metric is recorded only when the estimated RTT is lower than the
+    observed RTT.
+  </summary>
+</histogram>
+
+<histogram name="NQE.Accuracy.TransportRTT.EstimatedActualDiff" units="ms">
+  <owner>tbansal@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    Records the difference between the estimated transport RTT and the observed
+    transport RTT. Transport RTT predicted by the network quality estimator at
+    the time of navigation start is compared with the transport RTT observed
+    during the specified time interval following the start of the navigation.
+    This metric is recorded only when the estimated RTT is at least as high as
+    observed RTT.
+  </summary>
+</histogram>
+
 <histogram name="NQE.DifferenceRTTActualAndEstimated" units="ms">
   <owner>bengr@chromium.org</owner>
   <owner>tbansal@chromium.org</owner>
@@ -95057,6 +95107,53 @@ To add a new entry, add it with any value and run test to compute valid value.
   <affected-histogram name="Tabs.StateTransfer.Time_Inactive"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="NQE.Accuracy.RTT.AccuracyRecordingIntervals"
+    separator=".">
+  <suffix name="15"
+      label="Recorded approximately 15 seconds after navigation start"/>
+  <suffix name="30"
+      label="Recorded approximately 30 seconds after navigation start"/>
+  <suffix name="60"
+      label="Recorded approximately 60 seconds after navigation start"/>
+  <affected-histogram name="NQE.Accuracy.HttpRTT.ActualEstimatedDiff"/>
+  <affected-histogram name="NQE.Accuracy.HttpRTT.EstimatedActualDiff"/>
+  <affected-histogram name="NQE.Accuracy.TransportRTT.ActualEstimatedDiff"/>
+  <affected-histogram name="NQE.Accuracy.TransportRTT.EstimatedActualDiff"/>
+</histogram_suffixes>
+
+<histogram_suffixes name="NQE.Accuracy.RTT.ObservedRTTIntervals" separator=".">
+  <suffix name="0_20"
+      label="Observed RTT was between 0 and 20 (inclusive) msec"/>
+  <suffix name="20_60"
+      label="Observed RTT was between 20 and 60 (inclusive) msec"/>
+  <suffix name="60_140"
+      label="Observed RTT was between 60 and 140 (inclusive) msec"/>
+  <suffix name="140_300"
+      label="Observed RTT was between 140 and 300 (inclusive) msec"/>
+  <suffix name="300_620"
+      label="Observed RTT was between 300 and 620 (inclusive) msec"/>
+  <suffix name="620_1260"
+      label="Observed RTT was between 620 and 1260 (inclusive) msec"/>
+  <suffix name="1260_2540"
+      label="Observed RTT was between 1260 and 2540 (inclusive) msec"/>
+  <suffix name="2540_5100"
+      label="Observed RTT was between 2540 and 51000 (inclusive) msec"/>
+  <suffix name="5100_Infinity"
+      label="Observed RTT was greater than 5100 (inclusive) msec"/>
+  <affected-histogram name="NQE.Accuracy.HttpRTT.ActualEstimatedDiff.15"/>
+  <affected-histogram name="NQE.Accuracy.HttpRTT.ActualEstimatedDiff.30"/>
+  <affected-histogram name="NQE.Accuracy.HttpRTT.ActualEstimatedDiff.60"/>
+  <affected-histogram name="NQE.Accuracy.HttpRTT.EstimatedActualDiff.15"/>
+  <affected-histogram name="NQE.Accuracy.HttpRTT.EstimatedActualDiff.30"/>
+  <affected-histogram name="NQE.Accuracy.HttpRTT.EstimatedActualDiff.60"/>
+  <affected-histogram name="NQE.Accuracy.TransportRTT.ActualEstimatedDiff.15"/>
+  <affected-histogram name="NQE.Accuracy.TransportRTT.ActualEstimatedDiff.30"/>
+  <affected-histogram name="NQE.Accuracy.TransportRTT.ActualEstimatedDiff.60"/>
+  <affected-histogram name="NQE.Accuracy.TransportRTT.EstimatedActualDiff.15"/>
+  <affected-histogram name="NQE.Accuracy.TransportRTT.EstimatedActualDiff.30"/>
+  <affected-histogram name="NQE.Accuracy.TransportRTT.EstimatedActualDiff.60"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="NQE.DifferentPercentiles" separator=".">
   <suffix name="Percentile0" label="0th percentile"/>
   <suffix name="Percentile10" label="10th percentile"/>