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/dashboard/DashboardSummary.java

@@ -87,7 +87,8 @@ public class DashboardSummary extends InstrumentedFragment {
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         super.onCreateOptionsMenu(menu, inflater);
-        HelpUtils.prepareHelpMenuItem(getActivity(), menu, R.string.help_uri_dashboard);
+        HelpUtils.prepareHelpMenuItem(getActivity(), menu, R.string.help_uri_dashboard,
+                getClass().getName());
     }
 
     @Override