Add an active tabs page.

The active tabs page gives the user the ability to see all of their
open tabs in a list, and switch tabs, create a new one, or close
an old one.

Fix for http://b/issue?id=2101994

Change-Id: Id4c14dd437f769144dbdb02011144ea97d8fd030
diff --git a/res/values/strings.xml b/res/values/strings.xml
index b224517..3654c74 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -20,6 +20,8 @@
 
     <!-- Name of menu item of a new tab.  Also used in the title bar when displaying a new tab -->
     <string name="new_tab">New tab</string>
+    <!-- Name of menu item which brings up a list of the currently active tabs -->
+    <string name="active_tabs">Tabs</string>
     <!-- Name of tab containing bookmarks -->
     <string name="tab_bookmarks">Bookmarks</string>
     <!-- Name of tab containing the user's most visited websites, organized by number of visits -->