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For 1x1 YUV images the sample size will be larger than the height, so
upon dividing the integer height by the sample size we get a result
of zero chunks for processing. Additionally, since the code wasn't
accounting for the last row of odd height frames, it would do nothing
on a 1x1 frame.

The fix is to ensure we always process an extra row in the last task
when we've got an odd height frame.

R=thomasanderson

Fixed: 1034955
Change-Id: Ic6733ffb31bd2040769d7bc63e9096aea756cbbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016359
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735077}