BUG=swiftshader:15

Change-Id: Ib822b50c0a14e5ebc114db9759cbeecbb9f7a3c1
Reviewed-on: https://chromium-review.googlesource.com/403472Reviewed-by: Jim Stichnoth <stichnot@chromium.org>
Tested-by: Nicolas Capens <nicolascapens@google.com>