Expand the clip rect for cull rect verification.
Expand the clip rect for cull rect verification.

Discussion with Skia team revealed that skia expands the cull rect by one pixel (effectively) when rejection testing, so expand our verification by one pixel too.

BUG=496260

Review URL: https://codereview.chromium.org/1168093003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@196766 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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