Added metrics for background video playback.

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. A user action should be tied to an actual
 action taken by a user. It should be logged immediately after a user takes the
@@ skipping 8478 matching lines @@
   </description>
 </action>
 
 <action name="Media.Controls.VolumeChangeEnd">
   <owner>mlamouri@chromium.org</owner>
   <description>
     The user stopped interacting with the control's volume slider.
   </description>
 </action>
 
+<action name="Media.Hidden">
+  <owner>avayvod@chromium.org</owner>
+  <description>A renderer media delegate is notified it's hidden.</description>
+</action>
+
+<action name="Media.RemoteControls.Pause">
+  <owner>avayvod@chromium.org</owner>
+  <description>Media delegate is requested to pause media.</description>
+</action>
+
+<action name="Media.RemoteControls.Play">
+  <owner>avayvod@chromium.org</owner>
+  <description>Media delegate is requested to resume media.</description>
+</action>
+
+<action name="Media.Session.BackgroundResume">
+  <owner>avayvod@chromium.org</owner>
+  <description>
+    Background video playback started for the render frame.
+  </description>
+</action>
+
+<action name="Media.Session.BackgroundSuspend">
+  <owner>avayvod@chromium.org</owner>
+  <description>
+    Background video playback stopped for the render frame.
+  </description>
+</action>
+
+<action name="Media.Shown">
+  <owner>avayvod@chromium.org</owner>
+  <description>A renderer media delegate is notified it's shown.</description>
+</action>
+
 <action name="MediaContextMenu_Controls">
   <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="MediaContextMenu_Loop">
   <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>
 
@@ skipping 6824 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>