Summary:
Instantiates the _pendingRequests array before trying to add to it. As it currently stands, we try to add the pending request before the array is created. getCurrentPosition always fails on the first try.
Closes https://github.com/facebook/react-native/pull/4764
Reviewed By: svcscm
Differential Revision: D2764751
Pulled By: androidtrunkagent
fb-gh-sync-id: 411a03ff16d40725d8cc0909607632045eb5a27b