…#15389)

…#15389)

Summary:
**Motivation**

Fix an issue (facebook#15389) where `TVEventHandler` would not work when a modal was visible.  The solution adds the gesture recognizers from the native `RCTTVRemoteHandler` to the native modal view (except for the menu button recognizer, which still needs special handling in modals).  This PR also fixes some breakages in compiling React Native for tvOS.

**Test plan**

Compilation fixes should enable tvOS compile test to pass in Travis CI.

The modal fix can be tested with the following component, modified from the original source in facebook#15389 .

``` javascript
import React, { Component } from 'react';
import ReactNative from 'ReactNative';
import {
    Text,
    View,
    StyleSheet,
    TouchableHighlight,
    TVEventHandler,
    Modal,
} from 'react-native';

export default class Events extends Component {

    constructor(props) {
        super(props);

        this.state = {
            modalVisible: false,
        };
        this._tvEventHandler = new TVEventHandler();
    }

    _enableTVEventHandler() {
        this._tvEventHandler.enable(this, (cmp, evt) => {
            const myTag = ReactNative.findNodeHandle(cmp);
            console.log('Event.js TVEventHandler: ', evt.eventType);
            // if (evt.eventType !== 'blur' && evt.eventType !== 'focus') {
            //  console.log('Event.js TVEventHandler: ', evt.eventType);
            // }
        });
    }

    _disableTVEventHandler() {
        if (this._tvEventHandler) {
            this._tvEventHandler.disable();
            delete this._tvEventHandler;
        }
    }

    componentDidMount() {
        this._enableTVEventHandler();
    }

    componentWillUnmount() {
        this._disableTVEventHandler();
    }

    _renderRow() {
        return (
            <View style={styles.row}>
                {
                    Array.from({ length: 7 }).map((_, index) => {
                        return (
                            <TouchableHighlight
                                key={index}
                                onPress={() => { this.setState({ modalVisible: !this.state.modalVisible }); }}
                            >
                                <View style={styles.item}>
                                    <Text style={styles.itemText}>{ index }</Text>
                                </View>
                            </TouchableHighlight>
                        );
                    })
                }
            </View>
        );
    }

    onTVEvent(cmp, evt) {
      console.log('Modal.js TVEventHandler: ', evt.eventType);
    }

    hideModal() {
      this.setState({
        modalVisible: false
      });
    }

    render() {
        return (
            <View style={styles.container}>
                <Modal visible={this.state.modalVisible}
                       onRequestClose={() => this.hideModal()}>
                    <View style={styles.modal}>
                        { this._renderRow() }
                        { this._renderRow() }
                    </View>
                </Modal>
                { this._renderRow() }
                { this._renderRow() }
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: 'darkslategrey',
    },
    row: {
        flexDirection: 'row',
        padding: 30,
    },
    item: {
        width: 200,
        height: 100,
        borderColor: 'cyan',
        borderWidth: 2,
        margin: 30,
        alignItems: 'center',
        justifyContent: 'center',
    },
    itemText: {
        fontSize: 40,
        color: 'cyan',
    },
    modal: {
        flex: 1,
        backgroundColor: 'steelblue',
    },
});
```
**Release Notes**

After this change, the `onRequestClose` property will be required for a `Modal` in Apple TV.
Closes facebook#16076

Differential Revision: D6288801

Pulled By: hramos

fbshipit-source-id: 446ae94a060387324aa9e528bd93cdabc9b5b37f