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The math on this line was using integers, which means it could end up
dropping fractional parts so that the DCHECK against sizeimage could
fail. This fixes that problem.

BUG=b:147411004
TEST=Fixes DCHECK on trogdor vea tests

Change-Id: Ia4034e790268323a9decdfffe0815b69da8cefbc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2086193
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Auto-Submit: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#748763}