message: Requested app bar layout so search bar is centered
  Otherwise the margins aren't applied when search toolbar first loads
diff: @@ -17,6 +17,12 @@ public class SearchToolbarView extends SearchBar {
  };
  }
  + @Override
  + protected void onAttachedToWindow() {
  + super.onAttachedToWindow();
  + getParent().requestLayout();
  + }
  +
  void setNavIconSource(@Nullable ReadableMap source) {
  IconResolver.setIconSource(source, navIconResolverListener, getContext());
  }
  