[Night Light] CL2: Ash and system tray work

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 16304 matching lines @@
 <action name="Tray_Help">
   <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="Tray_LockScreen">
   <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="Tray_NightLight">
+  <owner>afakhry@chromium.org</owner>
+  <description>
+    User action to toggle the Night Light feature on/off.

[Mark P, 2017/05/08 23:18:09]

optional nit: Everything here is a user action.  Perhaps drop that part of the
phrase, "Toggled the ..."

[afakhry, 2017/05/09 00:06:30]

I updated the comment.

+  </description>
+</action>
+
 <action name="Tray_Overview">
   <owner>bruthig@chromium.org</owner>
   <owner>tdanderson@chromium.org</owner>
   <description>
     Records when the user presses the overview mode button in the Ash system
     tray. Overview mode is a feature of Ash that shows thumbnails of all
     currently-open windows.
   </description>
 </action>
 
@@ skipping 617 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>