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 10952 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>tdanderson@chromium.org</owner>
+  <owner>flackr@chromium.org</owner>
+  <description>
+    Starting a window selection cycle by pressing alt-tab.
+  </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>
+  <owner>tdanderson@chromium.org</owner>
+  <owner>flackr@chromium.org</owner>
+  <description>Starting the window overview mode.</description>
 </action>
 
-<action name="WindowSelector_Selection">
-  <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 name="WindowSelector_OverviewEnterKey">
+  <owner>tdanderson@chromium.org</owner>
+  <owner>flackr@chromium.org</owner>
+  <description>
+    Using the enter key to select a window in the overview.
+  </description>
 </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>