When drawing points, culling is disabled to make sure the generated point
sprites are not culled. Since there are no dirty bits for pointDrawMode or
multiSample, they were not being checked to ensure the rasterizer state was
correct.

BUG=586531

Change-Id: I8fe60dd8d5bbc79b1bce2c0aa62c40cee560fe24
Reviewed-on: https://chromium-review.googlesource.com/327862Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>