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The intermediate multiplication result was too large to store in float
precisely, therefore there was a rounding error. To mitigate this, we
apply a rounding for the integer conversion.

We only need this for scale up since the granularity is finer.

Bug: 881458
Change-Id: I9c07fdfb71fcbc59f36f5094bf813053cac8d8e8
Reviewed-on: https://chromium-review.googlesource.com/1214686
Commit-Queue: Shimi Zhang <ctzsm@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590147}