Apple TV: TouchableOpacity and Button need hasTVPreferredFocus support

Summary:
**Motivation**

Give `TouchableOpacity` and `Button` the same TV focus support as is already present in `TouchableHighlight`.

**Test plan**

Manual testing on TV simulator and devices.
Closes https://github.com/facebook/react-native/pull/15561

Differential Revision: D5665976

Pulled By: hramos

fbshipit-source-id: 0d5c588e1c82471f23617a3df1b77abc589a7c63

Libraries/Components/Button.js

@@ -58,6 +58,7 @@ class Button extends React.Component<{
   accessibilityLabel?: ?string,
   disabled?: ?boolean,
   testID?: ?string,
+  hasTVPreferredFocus?: ?boolean,
 }> {
   static propTypes = {
     /**
@@ -84,6 +85,12 @@ class Button extends React.Component<{
      * Used to locate this view in end-to-end tests.
      */
     testID: PropTypes.string,
+    /**
+     * *(Apple TV only)* TV preferred focus (see documentation for the View component).
+     *
+     * @platform ios
+     */
+    hasTVPreferredFocus: PropTypes.bool,
   };
 
   render() {
@@ -92,6 +99,7 @@ class Button extends React.Component<{
       color,
       onPress,
       title,
+      hasTVPreferredFocus,
       disabled,
       testID,
     } = this.props;
@@ -121,6 +129,7 @@ class Button extends React.Component<{
         accessibilityComponentType="button"
         accessibilityLabel={accessibilityLabel}
         accessibilityTraits={accessibilityTraits}
+        hasTVPreferredFocus={hasTVPreferredFocus}
         testID={testID}
         disabled={disabled}
         onPress={onPress}>

Libraries/Components/Touchable/TouchableOpacity.js

@@ -129,6 +129,12 @@ var TouchableOpacity = createReactClass({
      * active. Defaults to 0.2.
      */
     activeOpacity: PropTypes.number,
+    /**
+     * *(Apple TV only)* TV preferred focus (see documentation for the View component).
+     *
+     * @platform ios
+     */
+    hasTVPreferredFocus: PropTypes.bool,
     /**
      * Apple TV parallax effects
      */
@@ -246,6 +252,7 @@ var TouchableOpacity = createReactClass({
         testID={this.props.testID}
         onLayout={this.props.onLayout}
         isTVSelectable={true}
+        hasTVPreferredFocus={this.props.hasTVPreferredFocus}
         tvParallaxProperties={this.props.tvParallaxProperties}
         hitSlop={this.props.hitSlop}
         onStartShouldSetResponder={this.touchableHandleStartShouldSetResponder}