Add owners and descripts to some Chrome Now metrics actions.

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 2878 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="Go">
   <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="GoogleNow.ButtonClicked0">
-  <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>robliao@chromium.org</owner>
+  <owner>skare@chromium.org</owner>
+  <description>
+    User clicked button index 0 (0-based) of a Now Notification.
+  </description>
 </action>
 
 <action name="GoogleNow.ButtonClicked1">
-  <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>robliao@chromium.org</owner>
+  <owner>skare@chromium.org</owner>
+  <description>
+    User clicked button index 1 (0-based) of a Now Notification.
+  </description>
 </action>
 
 <action name="GoogleNow.Dismissed">
-  <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>robliao@chromium.org</owner>
+  <owner>skare@chromium.org</owner>
+  <description>User dismissed a Now Notification.</description>
 </action>
 
 <action name="GoogleNow.MessageCenter.NotificationPoppedUp">
   <owner>robliao@chromium.org</owner>
   <owner>skare@chromium.org</owner>
   <description>
     A Google Now notification was popped up to the user.
   </description>
 </action>
 
 <action name="GoogleNow.MessageClicked">
-  <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>robliao@chromium.org</owner>
+  <owner>skare@chromium.org</owner>
+  <description>
+    User clicked on the message text of a Now notification.
+  </description>
 </action>
 
 <action name="GoogleNow.WelcomeToastClickedNo">
-  <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>robliao@chromium.org</owner>
+  <owner>skare@chromium.org</owner>
+  <description>
+    User dismissed the Now Notifications welcome toast via the &quot;don't show
+    me notifications&quot; button.
+  </description>
 </action>
 
 <action name="GoogleNow.WelcomeToastClickedYes">
-  <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>robliao@chromium.org</owner>
+  <owner>skare@chromium.org</owner>
+  <description>
+    User dismissed the Now Notifications welcome toast via the ok button.
+  </description>
 </action>
 
 <action name="GoogleNow.WelcomeToastDismissed">
-  <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>robliao@chromium.org</owner>
+  <owner>skare@chromium.org</owner>
+  <description>
+    User dismissed the Now Notifications welcome toast via the x.
+  </description>
 </action>
 
 <action name="GpuAccelerationDisabled">
   <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="GpuAccelerationEnabled">
   <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 8503 matching lines @@
     apple-mobile-webapp-capable meta tag.
   </description>
 </action>
 
 <action name="webapps.AddShortcut.Bookmark">
   <owner>dfalcantara@chromium.org</owner>
   <description>Shortcut added to the homescreen for a bookmark.</description>
 </action>
 
 </actions>