Center the focus of the text input in magnifier screen.

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 8519 matching lines @@
 <action name="Options_AccessibilityOnScreenKeyboard_Disable">
   <owner>stevenjb@chromium.org</owner>
   <description>Settings: Accessibility: Disable on-screen keyboard</description>
 </action>
 
 <action name="Options_AccessibilityOnScreenKeyboard_Enable">
   <owner>stevenjb@chromium.org</owner>
   <description>Settings: Accessibility: Enable on-screen keyboard</description>
 </action>
 
+<action name="Options_AccessibilityScreenMagnifierCenterFocus_Disable">
+  <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="Options_AccessibilityScreenMagnifierCenterFocus_Enable">
+  <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="Options_AccessibilityScreenMagnifier_Disable">
   <owner>stevenjb@chromium.org</owner>
   <description>Settings: Accessibility: Disable screen magnifier</description>
 </action>
 
 <action name="Options_AccessibilityScreenMagnifier_Enable">
   <owner>stevenjb@chromium.org</owner>
   <description>Settings: Accessibility: Enable screen magnifier</description>
 </action>
 
@@ skipping 3893 matching lines @@
 <action name="webapps.AddShortcut.Manifest">
   <owner>mlamouri@chromium.org</owner>
   <description>
     Shortcut added to the homescreen with a valid Manifest. This action will be
     recorded in addition to AppShortcut, AppShortcutApple and Bookmark actions
     to keep a trend of whether the webapp also add meta tags.
   </description>
 </action>
 
 </actions>