Extract a GrCCPathParser class that is decoupled from atlas ops

Allows coverage counts ultimately to be drawn either to an atlas or
directly to the framebuffer.

Bug: skia:
Change-Id: I6cc07fce562c223381b89586d19ae98298bafe4d
Reviewed-on: https://skia-review.googlesource.com/96083
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
10 files changed