Summary:Thanks for submitting a pull request! Please provide enough information so that others can review your pull request:
(You can skip this if you're fixing a typo or adding an app to the Showcase.)
Explain the **motivation** for making this change. What existing problem does the pull request solve?
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**Test plan (required)**
Demonstrate the code is solid. Example: The exact commands you ran and their output, screenshots / videos if the pull request changes UI.
Make sure tests pass on both Travis and Circle CI.
**Code formatting**
Look around. Match the style of the rest of the codebase. See also the simple [style guide](https://github.com/facebook/react-native/blob/master/CONTRIBUTING.md#style-guide).
Closes https://github.com/facebook/react-native/pull/6706
Differential Revision: D3109403
fb-gh-sync-id: 4c92b4dc7950377f9efad6129a49c594bcd9a68a
fbshipit-source-id: 4c92b4dc7950377f9efad6129a49c594bcd9a68a
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