Added a UI for the Interests Prototype.

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 immediatly after a user takes the
@@ skipping 8074 matching lines @@
 <action name="MobileMenuShare">
   <owner>aurimas@chromium.org</owner>
   <description>User pressed 'Share' in the app menu.</description>
 </action>
 
 <action name="MobileMenuShow">
   <owner>aurimas@chromium.org</owner>
   <description>User opened the app menu.</description>
 </action>
 
+<action name="MobileNTP.Interests.OpenDialog">
+  <owner>peconn@chromium.org</owner>
+  <description>User opens the interests dialog.</description>

[newt (away), 2015/12/12 00:30:32]

s/opens/opened/

[PEConn, 2015/12/14 17:05:16]

Done.

+</action>
+
 <action name="MobileNTPBookmark">
   <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="MobileNTPForeignSession">
   <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 5082 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>