Return true to indicate that FlingToCustomEndpoint should be called from ProcessUp when _scrollViewWillEndDragging is non-null (i.e., when a OnScrollViewDraggingEndChangingListener has been set via a call to SetScrollViewWillEndDragging). NOTE: This method returns 'true' by default to preserve existing behavior where FlingToCustomEndpoint was ALWAYS called if an OnScrollViewDraggingEndChangingListener was set.
Target Platforms: Android 4.4+, iOS 8+
Development Environments: Visual Studio 2015+, Visual Studio for Mac Preview, Xamarin for Visual Studio 4.2+
