Add Bookmark All Tabs UMA metric

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 1310 matching lines @@
 <action name="Bold">
   <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="BookmarkAdded">
   <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="BookmarkAllTabs">
+  <owner>wittman@chromium.org</owner>
+  <description>
+    User selected Bookmark All Tabs... from anywhere in the UI.

[Mark P, 2014/11/25 04:56:21]

nit: what do you mean by "..."?  If you mean something by it, explain it,
otherwise omit it.

[Mike Wittman, 2014/12/03 20:22:38]

"Bookmark All Tabs..." is the actual text in the menu. I've removed the ellipses
to avoid confusion.

+  </description>
+</action>
+
 <action name="BookmarkBarFolder_CtxMenu">
   <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="BookmarkBarFolder_DragEnd">
   <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 9572 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="SystemBackForNavigation">
   <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="TabContextMenu_BookmarkAllTabs">
-  <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>wittman@chromium.org</owner>
+  <description>
+    User selected Bookmark All Tabs... from the tab context menu.
+  </description>
 </action>
 
 <action name="TabContextMenu_CloseOtherTabs">
   <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="TabContextMenu_CloseTab">
   <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 774 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>