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Summary: If tracking is enabled and the sampling check passes on a scroll or layout event, we compare the scroll offset to the layout of the rendered items. If the items don't cover the visible area of the list, we fire an `onFillRateExceeded` call with relevant stats for logging the event through an analytics pipeline. The measurement methodology is a little jank because everything is async, but it seems directionally useful for getting ballpark numbers, catching regressions, and tracking improvements. Benchmark testing shows a ~2014 MotoX starts hitting the fill rate limit at about 2500 px / sec, which is pretty fast scrolling. This also reworks our frame rate stuff so we can use a shared `SceneTracking` thing and track blankness globally. Reviewed By: bvaughn Differential Revision: D4806867 fbshipit-source-id: 119bf177463c8c3aa51fa13d1a9d03b1a96042aa