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DON'T MERGE YET.
This work should help prevent layout thrashing when multiple elements are consuming scroll position and doing writes in their scroll handlers.
The general idea is to cache the first read of scrollTop/scrollLeft, so that subsequent reads are cached. Elements doing work in their scroll handlers aren't allowed to read props that trigger layout without caching them upfront. Writes from scroll handlers are allowed.
Should help for #18 and PolymerElements/iron-list#331