Help fallbacks and intent work

- Handle a backup URI, so that if the specified URI is not available,
   another can be used.
 - Add some data to help intents when they are intent URIs
 - Fill in the context with a classname when it isn't present

Bug: 15475009
Change-Id: I7050fa61121901929e650b20bd7a0ae21e8ba207

src/com/android/settings/applications/ManageApplications.java

@@ -461,7 +461,7 @@ public class ManageApplications extends InstrumentedFragment
             return;
         }
         HelpUtils.prepareHelpMenuItem(getActivity(), menu, mListType == LIST_TYPE_MAIN
-                ? R.string.help_uri_apps : R.string.help_uri_notifications);
+                ? R.string.help_uri_apps : R.string.help_uri_notifications, getClass().getName());
         mOptionsMenu = menu;
         inflater.inflate(R.menu.manage_apps, menu);
         updateOptionsMenu();