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 303ecd95778148fe122524c94f37dde5b5747e04..661cd637ce5f293ffd1e4b5c80d627bda57af887 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -51509,6 +51509,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="PopupZoomer.TapDisambiguation" enum="TapDisambiguation">

[Ilya Sherman, 2017/03/24 22:16:57]

It looks like you're adding a new top-level category name, "PopupZoomer".  This
doesn't seem like a sufficiently general name to be a top-level category. 
Please consider whether there isn't an existing category that's a good fit
already; and if not, please try to come up with a top-level category name that's
more general/intuitive for someone who isn't on your immediate team.

[aelias_OOO_until_Jul13, 2017/03/24 22:30:31]

OK, switched to existing category "Touchscreen".

+  <owner>aelias@chromium.org</owner>
+  <summary>
+    How the user interacted with the tap disambiguation feature on Android.
+  </summary>
+</histogram>
+
 <histogram name="Power.BacklightLevelOnAC" units="%">
   <owner>derat@chromium.org</owner>
   <summary>
@@ -112305,6 +112312,13 @@ from previous Chrome versions.
   <int value="1" label="Undelayed Tap"/>
 </enum>
 
+<enum name="TapDisambiguation" type="int">
+  <int value="0" label="TappedInside"/>
+  <int value="1" label="TappedOutside"/>
+  <int value="2" label="BackButton"/>
+  <int value="3" label="Other"/>
+</enum>
+
 <enum name="TcpSocketStatus" type="int">
   <int value="0" label="Unknown"/>
   <int value="1" label="Fast Connection Return"/>