Add UMA Description for OmniboxMobileSearch

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 9307 matching lines @@
   <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="MobileOmniboxRefineSuggestion">
   <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="MobileOmniboxSearch">
-  <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>mpearson@chromium.org</owner>
+  <owner>tedchoc@chromium.org</owner>
+  <description>
+    User used the omnibox to go somewhere.  The action doesn't have to lead to a
+    search page (except on iOS, where this is only recorded for search-type
+    navigations).
+  </description>
+  <obsolete>
+    Removed Sep 2016 because the name kept misleading people.  Replaced with
+    MobileOmniboxUse, which has the same semantics.
+  </obsolete>
+</action>
+
+<action name="MobileOmniboxUse">
+  <owner>mpearson@chromium.org</owner>
+  <owner>tedchoc@chromium.org</owner>
+  <description>
+    User used the omnibox to go somewhere.  The action doesn't have to lead to a
+    search page.
+  </description>
 </action>
 
 <action name="MobileOmniboxVoiceSearch">
   <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="MobilePageLoaded" not_user_triggered="true">
   <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 6038 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>