Add NetworkQualityEstimator (NQE) UMA when ECT is computed

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 eef0a376034b7a9d51553b265a49c94b159950ff..f0179371bc12ccbdec621e7421607a01ab0bafa7 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -40836,6 +40836,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NQE.EffectiveConnectionType.OnECTComputation"
+    enum="NQEEffectiveConnectionType">
+  <owner>tbansal@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    Effective connection type estimated by the network quality estimator.
+    Recorded every time the effective connection type is computed.
+  </summary>
+</histogram>
+
 <histogram name="NQE.EstimateAvailable.MainFrame" enum="Boolean">
   <owner>tbansal@chromium.org</owner>
   <owner>bengr@chromium.org</owner>
@@ -40905,6 +40915,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NQE.Kbps.OnECTComputation" units="Kbps">
+  <owner>bengr@chromium.org</owner>
+  <owner>tbansal@chromium.org</owner>
+  <summary>
+    Rough estimate of the downstream peak throughput (in kilobits per second).
+    Recorded by the network quality estimator every time the effective
+    connection type is computed.
+  </summary>
+</histogram>
+
 <histogram name="NQE.MainFrame.EffectiveConnectionType"
     enum="NQEEffectiveConnectionType">
   <owner>tbansal@chromium.org</owner>
@@ -41025,6 +41045,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NQE.RTT.OnECTComputation" units="ms">
+  <owner>bengr@chromium.org</owner>
+  <owner>tbansal@chromium.org</owner>
+  <summary>
+    Rough estimate of the round trip time at the URLRequest layer.  Recorded by
+    the network quality estimator every time the effective connection type is
+    computed.
+  </summary>
+</histogram>
+
 <histogram name="NQE.RTTObservations" units="ms">
   <obsolete>
     Replaced in May 2016 by NQE.MainFrame.RTT.* metrics.
@@ -41052,6 +41082,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="NQE.TransportRTT.OnECTComputation" units="ms">
+  <owner>bengr@chromium.org</owner>
+  <owner>tbansal@chromium.org</owner>
+  <summary>
+    Rough estimate of the computed round trip time at the transport layer.
+    Recorded by the network quality estimator every time the effective
+    connection type is computed.
+  </summary>
+</histogram>
+
 <histogram name="ntp.searchurls.total">
   <obsolete>
     Deprecated 04/2016 as doesn't have data nor owner.
@@ -99227,7 +99267,11 @@ value.
   <int value="3" label="2G"/>
   <int value="4" label="3G"/>
   <int value="5" label="4G"/>
-  <int value="6" label="Broadband"/>
+  <int value="6" label="Broadband">
+    <obsolete>
+      Deprecated as of 01/2017.
+    </obsolete>
+  </int>
 </enum>
 
 <enum name="NQEExternalEstimateProviderStatus" type="int">