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This CL makes FixedHeightScrollable able to measure heights. In the DOM-based version, FixedHeightScrollable forced a synchronous layout in a microtask in order to measure the size of itself and its children. In the DOM-less version, we now require the subclass to tell us the item height and we measure our own height using a layout callback. R=ianh@google.com Review URL: https://codereview.chromium.org/1161063005