Simplify GrProcOptInfo initialization.

Removes unused single channel tracking.

Makes it so that only the op/gp can initiate lcd coverage.

Makes GrProcOptInfo fragment processor analysis continuable.

Change-Id: I003a8aa3836bb64d04b230ddee581dc500e613a9
Reviewed-on: https://skia-review.googlesource.com/7039
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
15 files changed