Use faster case for on tile sampling, and a little clean up. This has been a sampling bug and so was bypassed using "false &&". Found the sampling bug and added the case back in.

Remove long commented out code.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2044373003

Review-Url: https://codereview.chromium.org/2044373003
1 file changed