message: Defaulted placeholder only on ios
  Don't want to change android behaviour - need to see what happens when migrate android to fabric
diff: @@ -12,11 +12,11 @@ class SearchBar extends React.Component<any, any> {
  this.onChangeBounds = this.onChangeBounds.bind(this);
  }
  static defaultProps = {
  - placeholder: 'Search',
  obscureBackground: true,
  hideNavigationBar: true,
  hideWhenScrolling: false,
  autoCapitalize: 'sentences',
  + placeholder: Platform.OS === 'ios' ? 'Search' : undefined,
  }
  onChangeText({nativeEvent}) {
  var {onChangeText} = this.props as any;
  