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This removes support for pre-refresh modes.  It does not change the design of
path computations/drawing or other deeper refactors.

Also does some other minor cleanup, and fixes one clear bug with high DPI in
PaintChildren().

Bug: 873855
Change-Id: I3496ea60ed670d5f1c30abf33b989162c558fa16
Reviewed-on: https://chromium-review.googlesource.com/1231898Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592527}