Enable nested scrolling for locale picker

This change is to make the locale picker list enable the nested
scrolling feature. It is necessay to enable this feature to be able to
work with CollapsingToolbarLayout.

Fixes: 207318265
Fixes: 213036789
Test: manual test
1. Verify the locale picker works with Activity
2. Verify the locale picker works with SettingsBaseActivity

Change-Id: Iaf90211da640cd265fc2b23dd34b3149c4406891
(cherry picked from commit fa861a6b5d)
Merged-In:Iaf90211da640cd265fc2b23dd34b3149c4406891

core/java/com/android/internal/app/LocalePickerWithRegion.java

@@ -158,6 +158,14 @@ public class LocalePickerWithRegion extends ListFragment implements SearchView.O
         setListAdapter(mAdapter);
     }
 
+    @Override
+    public void onViewCreated(View view, Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+        // In order to make the list view work with CollapsingToolbarLayout,
+        // we have to enable the nested scrolling feature of the list view.
+        getListView().setNestedScrollingEnabled(true);
+    }
+
     @Override
     public boolean onOptionsItemSelected(MenuItem menuItem) {
         int id = menuItem.getItemId();