Tutorial improvement for Accessibility shortcut (1/n).

Because can't save the value into setting keys for the service before version R, and in order to let tutorial dialog can get the consistent value, using alternative that each fragment with shortcut to must implement the new abstract method.

Bug: 148989018
Test: manual test
Change-Id: Iba2a7daa70eb00f0bba37317c9355531fbb77628

src/com/android/settings/accessibility/LaunchAccessibilityActivityPreferenceFragment.java

@@ -100,6 +100,12 @@ public class LaunchAccessibilityActivityPreferenceFragment extends
         showDialog(DialogEnums.EDIT_SHORTCUT);
     }
 
+    @Override
+    int getUserShortcutTypes() {
+        return AccessibilityUtil.getUserShortcutTypesFromSettings(getPrefContext(),
+                mComponentName);
+    }
+
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         // Do not call super. We don't want to see the "Help & feedback" option on this page so as