Add a count for Suggested Articles usage.

tools/metrics/actions/actions.xml

Index: tools/metrics/actions/actions.xml
diff --git a/tools/metrics/actions/actions.xml b/tools/metrics/actions/actions.xml
index bd18a32039164e29e5725601be278a04be66b4b0..e49140b5444f2aacef98d13ddb24129bd21d60d6 100644
--- a/tools/metrics/actions/actions.xml
+++ b/tools/metrics/actions/actions.xml
@@ -10283,6 +10283,15 @@ should be able to be added at any place in this file.
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="NewTabPage_ContentSuggestions_ArticlesUsageCount">
+  <owner>markusheintz@chromium.org</owner>
+  <description>
+    Records when a user uses the &quot;Articles for you&quot; section on the New
+    Tab Page. Usage is defined by scrolling to the section and opening an

[Marc Treib, 2016/11/17 11:10:23]

nit: s/and/or/
(as it is, IMO it sounds like it'd only be recorded after both events have
happened, but in fact it's recorded for the scroll and then again for the click)

[markusheintz_, 2016/11/17 13:48:47]

I change the description PTAL

+    article suggestion.
+  </description>
+</action>
+
 <action name="NewTabPage_ReopenTab">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>