Ensuring that AllAppsGridAdapter is public.

- Also show the search action when searching all apps

Change-Id: I3470b0da565e6d1bce637ce09384d966215a4ca7

src/com/android/launcher3/allapps/AllAppsGridAdapter.java

@@ -45,7 +45,7 @@ import java.util.List;
 /**
  * The grid view adapter of all the apps.
  */
-class AllAppsGridAdapter extends RecyclerView.Adapter<AllAppsGridAdapter.ViewHolder> {
+public class AllAppsGridAdapter extends RecyclerView.Adapter<AllAppsGridAdapter.ViewHolder> {
 
     public static final String TAG = "AppsGridAdapter";
     private static final boolean DEBUG = false;