toy to play with antialias raytracing

Here's the ray tracer I wrote.
I've commented out the calls to experimental
stroking -- enough of it remains working
to help visualize what you've been talking
to me about.

R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2014993002

Review-Url: https://codereview.chromium.org/2014993002
2 files changed