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* Use base:: functions to convert float->int
* Rounding is more accurate for percentages than truncating
* Shorten code

Bug: none
Change-Id: Ie968f402c44dd5f7739e11cb29bb32d866bc4fd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359003
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798697}