Add UMA actions for elements on the Hung Renderer Dialog

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 3166 matching lines @@
   <description>Please enter the description of this user action.</description>
 </action>
 
 <action name="Hotword.HotwordTrigger">
   <owner>amistry@chromium.org</owner>
   <owner>rlp@chromium.org</owner>
   <owner>somast@chromium.org</owner>
   <description>User triggered the hotword by saying 'Ok Google'.</description>
 </action>
 
+<action name="HungRendererDialogView.CloseButton">
+  <owner>wfh@chromium.org</owner>
+  <description>
+    Recorded when the Hung Renderer Dialog is closed using the close button.
+  </description>
+</action>
+
+<action name="HungRendererDialogView.Closed">
+  <owner>wfh@chromium.org</owner>
+  <description>
+    Recorded when the Hung Renderer Dialog has been closed because the user has
+    clicked a button or the renderer has become responsive again.
+  </description>
+</action>
+
+<action name="HungRendererDialogView.KillButton">
+  <owner>wfh@chromium.org</owner>
+  <description>
+    Recorded when the Kill button is clicked on the Hung Renderer Dialog.
+  </description>
+</action>
+
+<action name="HungRendererDialogView.Shown">
+  <owner>wfh@chromium.org</owner>
+  <description>
+    Recorded when the Hung Renderer Dialog has been shown to the user.
+  </description>
+</action>
+
+<action name="HungRendererDialogView.WaitButton">
+  <owner>wfh@chromium.org</owner>
+  <description>
+    Recorded when the Wait button is clicked on the Hung Renderer Dialog.
+  </description>
+</action>
+
 <action name="ImportLockDialogCocoa_Shown">
   <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="ImportLockDialogGtk_Shown">
   <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 8651 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>