[Herb] Add metrics to track button usage

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 2503 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="Cryptohome.PKCS11InitFail">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>
   <obsolete>Deprecated as of 11/2015.</obsolete>
 </action>
 
+<action name="CustomTabs.CloseButtonClicked">
+  <owner>dfalcantara@chromium.org</owner>
+  <description>Close button of the CustomTabActivity was clicked.</description>
+</action>
+
+<action name="CustomTabs.SystemBack">
+  <owner>dfalcantara@chromium.org</owner>
+  <description>
+    User hit the 'back' button in the CustomTabActivity.
+  </description>
+</action>
+
 <action name="CustomTabsCustomActionButtonClick">
   <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="CustomTabsMenuCustomMenuItem">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of the metric.</description>
 </action>
 
@@ skipping 10430 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="SystemBack">
   <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>
+  <owner>dfalcantara@chromium.org</owner>
+  <description>
+    The user navigated backward in the tab's history using the system back
+    button.
+  </description>
+  <obsolete>
+    Deprecated as of 02/2016. Now recorded in the histogram
+    &quot;Android.Activity.ChromeTabbedActivity.SystemBackAction&quot;.
+  </obsolete>
 </action>
 
 <action name="TabContextMenu_BookmarkAllTabs">
   <owner>wittman@chromium.org</owner>
   <description>
     User selected Bookmark All Tabs from the tab context menu.
   </description>
 </action>
 
 <action name="TabContextMenu_CloseOtherTabs">
@@ skipping 130 matching lines @@
 <action name="Tab_DropURLBetweenTabs">
   <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="Tab_DropURLOnTab">
   <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="TaskManagement.OpenInChromeActionButtonClicked">
+  <owner>dfalcantara@chromium.org</owner>
+  <description>
+    User hit the &quot;Open in Chrome&quot; action button.
+  </description>
+</action>
+
+<action name="TaskManagement.ReturnButtonClicked">
+  <owner>dfalcantara@chromium.org</owner>
+  <description>
+    User hit the &quot;X&quot; button to close the tab. The return button is an
+    explicit &quot;close this tab and return to the previous app&quot; button
+    that may appear to the left of the Omnibox.  This is different from regular
+    tab closing buttons because those doesn't send the user back to the previous
+    app.
+  </description>
+</action>
+
 <action name="TaskManager">
   <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="Terminate_ProcessMismatch_CreateNewWidget">
   <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 736 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>