Summary:
This prop exposes the functionality provided by Android ScrollView's setOverScrollMode method.
One interesting thing to note is that, if you were to read the Android docs, you would think that the value "always" is the default over scroll mode. However, the docs are incorrect and "always-if-content-scrolls" is actually the default value (http://stackoverflow.com/a/27116306).
**Test plan (required)**
Verified this change in a test app. Also, our team uses this change in our app.
Adam Comella
Microsoft Corp.
Closes https://github.com/facebook/react-native/pull/10905
Differential Revision: D4500957
Pulled By: mkonicek
fbshipit-source-id: 873eba38183defba133c228e0c1038efa83297d3
12c4868628