Launcher-side changes to support prediction bar.

Change-Id: Ib9974ad8888ad87137c774f9f531fae9d56b899a

src/com/android/launcher3/LauncherCallbacks.java

@@ -51,6 +51,7 @@ public interface LauncherCallbacks {
     public void finishBindingItems(final boolean upgradePath);
     public void onClickAllAppsButton(View v);
     public void onAllAppsShown();
+    public void onAllAppsHidden();
     public void bindAllApplications(ArrayList<AppInfo> apps);
     public void onClickFolderIcon(View v);
     public void onClickAppShortcut(View v);