Álvaro Medina Ballester 0c8a3e4f79 closes #13034 Fixes the ScrollViewMock methods
Summary:
Solves https://github.com/facebook/react-native/issues/13034

Now the `ScrollView` mock has all the methods available.

React Native tests pass.

To test this specific part of the code,

```sh
$ react-native init Test
$ cd Test/
$ yarn add react-navigation
```

Then, add a simple project that uses `react-navigation`:

```js
import React from 'react';
import { Text } from 'react-native';
import { StackNavigator } from 'react-navigation';

class HomeScreen extends React.Component {
  static navigationOptions = {
    title: 'Welcome',
  };
  render() {
    return <Text>Hello, Navigation!</Text>;
  }
}

const SimpleApp = StackNavigator({
  Home: { screen: HomeScreen },
});

export default SimpleApp
```

Run the default render tests:

```js
$ npm run test
```
Closes https://github.com/facebook/react-native/pull/13048

Differential Revision: D4746028

Pulled By: shergin

fbshipit-source-id: cb1791978d15be7f5d14b7b22979388066ad6caa
2017-11-28 12:32:37 -08:00
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