Reland "Remove antialiasing control from GrPaint."

This contains fixes for GLPrograms test and mixed samples rendering.

This reverts commit 419d81eed4a010e6080db199795117cbedf9e6e4.

BUG=skia:

Change-Id: If8f002fbfaaaab6d1607403f2b15ccc7f1e17e87
Reviewed-on: https://skia-review.googlesource.com/5763
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
76 files changed