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 e8671dc9551b1779a3a8de1214d94fcf1bb9af5f..afab301d45f797fe1288e19d6e877c671b837c0d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -12703,6 +12703,12 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Event.DownEventCount.PerDestination"
+    enum="DownEventDestination">
+  <owner>xiaoyinh@chromium.org</owner>
+  <summary>Counts the number of down events received per destination.</summary>
+</histogram>
+
 <histogram name="Event.DownEventCount.PerFormFactor" enum="DownEventFormFactor">
   <owner>xiaoyinh@chromium.org</owner>
   <summary>
@@ -75104,6 +75110,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="2" label="GET_NON_CACHABLE"/>
 </enum>
 
+<enum name="DownEventDestination" type="int">
+  <int value="0" label="Others"/>

[Mark P, 2016/09/13 21:57:11]

Does this include regular Chrome apps?  Perhaps that should be a separate
category and not "others"?

If Chrome apps isn't included here (perhaps in its websites?), then what does
this include?  You need to be clear.

+  <int value="1" label="System UI"/>

[Mark P, 2016/09/13 21:57:11]

Is this basically everything besides renderers and apps?  e.g., ChromeOS menus?

+  <int value="2" label="Website"/>

[Mark P, 2016/09/13 21:57:11]

Do you mean content area of a renderer?

+  <int value="3" label="ARC++ app"/>

[Mark P, 2016/09/13 21:57:11]

Do you mean specifically an Android app on Chrome or any app that's running on
an ARC++ device?

+  <int value="4" label="Default note-taking app"/>
+</enum>
+
 <enum name="DownEventFormFactor" type="int">
   <int value="0" label="Clamshell"/>
   <int value="1" label="Touchview"/>