Make perlin noise do CTM-correct scaling.

When drawing perlin noise, generate noise at the resolution determined
by CTM, not by the resolution at construction time. This required moving
the generation of PaintingData to getContext() and asNewEffect() for the
raster and GPU paths, respectively.

It also required adjusting the matrices used during rendering
to be translate-only.

R=sugoi@chromium.org, bsalomon@google.com

Author: senorblanco@chromium.org

Review URL: https://codereview.chromium.org/358903002
3 files changed