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Mats Byrkeland be715ec705 Make AccessibilityInfo.setAccessibilityFocus cross platform (#20229 )

Summary:
Currently, `AccessibilityInfo.setAccessibilityFocus` is only available on iOS. The same behaviour can be achieved on Android by dispatching the proper accessibility event. I implemented the same function for Android, to make life slightly more convenient for the developer.

Today, developers must write something like this:
```
if (Platform.OS === 'ios') {
     AccessibilityInfo.setAccessibilityFocus(reactTag)
} else {
     UIManager.sendAccessibilityEvent(reactTag, 8)
}
```

With this change, the following is enough for both Android and iOS:
```
AccessibilityInfo.setAccessibilityFocus(reactTag)
```
Pull Request resolved: https://github.com/facebook/react-native/pull/20229

Differential Revision: D8874107

Pulled By: mdvacca

fbshipit-source-id: a6ffd7bb89ce56d6d65b06419633a71dcf3d0733

2018-07-18 17:24:23 -07:00