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This unifies the painting code path between Views that are and are not
backed by layers, they all go through View::Paint now.

View::Paint will only translate the canvas relative to the parent when
layer() is false, keeping the origin at the origin of the view when it
is backed by a layer().

R=sky
BUG=466426

Review URL: https://codereview.chromium.org/1035833002

Cr-Commit-Position: refs/heads/master@{#322394}