Added UMA stats to overview mode

tools/metrics/actions/actions.xml

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <!--
 This file is a comprehensive list of Chrome user actions along with the owner
 and description for each user action.
 
@@ skipping 10934 matching lines @@
 <action name="Win8MetroRestart">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="WindowBorder_ClickTogglesSingleAxisMaximize">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
+<action name="WindowCycleController_Cycle">
+  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
+  <description>Please enter the description of the metric.</description>
+</action>
+
 <action name="WindowDrag_MaximizeLeft">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="WindowDrag_MaximizeRight">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="WindowSelector_Overview">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
-<action name="WindowSelector_Selection">
+<action name="WindowSelector_OverviewEnterKey">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <description>Please enter the description of the metric.</description>

[tdanderson, 2014/06/09 17:50:46]

Why are you making the <description> text different than all of the surrounding
ones? I looked at actions.xml in my local checkout and looks like only ~4
existing actions have this different text. What difference does it make?

[Nina, 2014/06/09 18:12:50]

Well, the automatic tool that extracts these tags from the code decided to write
that comment. I suggest we leave them like that, after all, they are just
placeholder comments.

 </action>
 
 <action name="WorkerProcess_BadProcessToKill">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="ZoomMinus">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
@@ skipping 73 matching lines @@
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="webapps.AddShortcut.Bookmark">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
 </action>
 
 </actions>