Allow override of `scrollEventThrottle` (in case `useNativeDriver` is not an option)

Reviewed By: achen1

Differential Revision: D4819635

fbshipit-source-id: 9cc7b32e05bf2c573553b9806a17141f1783a1c6

Libraries/Lists/VirtualizedList.js

@@ -272,6 +272,7 @@ class VirtualizedList extends React.PureComponent<OptionalProps, Props, State> {
         return <ScrollView {...props} />;
       }
     },
+    scrollEventThrottle: 50,
     updateCellsBatchingPeriod: 50,
     windowSize: 21, // multiples of length
   };
@@ -448,7 +449,7 @@ class VirtualizedList extends React.PureComponent<OptionalProps, Props, State> {
         onScroll: this._onScroll,
         onScrollBeginDrag: this._onScrollBeginDrag,
         ref: this._captureScrollRef,
-        scrollEventThrottle: 50, // TODO: Android support
+        scrollEventThrottle: this.props.scrollEventThrottle, // TODO: Android support
         stickyHeaderIndices,
       },
       cells,