We were not taking the state of GL_POLYGON_OFFSET_FILL into account.

BUG=371604

Change-Id: I9b490ed043faeece86665acaef0b865bf1f7b60d
Reviewed-on: https://chromium-review.googlesource.com/199120Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Nicolas Capens <nicolascapens@chromium.org>