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OnPaint() is not part of the recursion, it won't have access to the
necessary pieces to do recursion.

If you need to do painting while inside the recursion, this should
happen in PaintChildren(). So move the contents of OnPaint() to
PaintChildren().

R=estade@chromium.org
BUG=466426

Review URL: https://codereview.chromium.org/1029263011

Cr-Commit-Position: refs/heads/master@{#322487}