Fix float-to-int conversion warnings in the path rendering tests. BUG=angleproject:1382 Change-Id: I586cd4a03d06a6ec87b6a57342b7f8d0ed0d9cd8 Reviewed-on: https://chromium-review.googlesource.com/354031 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>