Add controllers for default app shortcut preferences.

For AppInfoDashboardFragment:
- add the default app shortcut preferences into the preference screen
instead of creating them dynamically.
- add controller for each of the shortcut preference.

Bug: 69384089
Test: make RunSettingsRoboTests
Change-Id: I1e81944a3bc867fd6a3a0d484bab77c3ad0e6441

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

@@ -21,7 +21,12 @@ import android.support.v7.preference.Preference;
 import com.android.internal.logging.nano.MetricsProto;
 import com.android.settings.SettingsActivity;
 import com.android.settings.Utils;
+import com.android.settings.applications.appinfo.DefaultAppShortcutPreferenceControllerBase;
 
+/**
+ * deprecated in favor of {@link DefaultAppShortcutPreferenceControllerBase}
+ */
+@Deprecated
 public class ShortcutPreference extends Preference {
 
     private final Class mTarget;