Fix float-to-int conversion warning.
Fix float-to-int conversion warning.

BUG=angleproject:1378

Change-Id: I92b902154432e82a1357e8623426256c4ca53ca3
Reviewed-on: https://chromium-review.googlesource.com/345585
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>

ppy/angle,ecoal95/angle,ppy/angle,MSOpenTech/angle,ecoal95/angle,domokit/waterfall,MSOpenTech/angle,MSOpenTech/angle,ecoal95/angle,ppy/angle,ppy/angle,ecoal95/angle,ecoal95/angle,MSOpenTech/angle,domokit/waterfall