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Summary: Fixes a bug that happens when trying to use ScrollView with sticky headers and native `Animated.event` with `onScroll`. Made a few changes to the ListViewPaging UIExplorer example to repro https://gist.github.com/janicduplessis/17e2fcd99c6ea49ced2954d881011b09. What happens is we need to be able to add multiple events to the same prop + viewTag pair. To do that I simple changed the data structure to `Map<prop+viewTag, List<AnimatedEventDriver>>` and try to optimize for the case where there is only one item in the list since it will be the case 99% of the time. **Test plan** Tested by reproducing the bug with the above gist and made sure it was fixed after applying this diff. Closes https://github.com/facebook/react-native/pull/12697 Differential Revision: D4656347 Pulled By: sahrens fbshipit-source-id: b5c36ba796f478e56028c7a95bc0f86bc54cb2ce