Removes tracking of whether color is ignored by XP.

Removes the feedback to GrDrawOp via GrPipelineOptimizations.

Change-Id: I3cb17cad41779af292a92385fcd5ac23ae5a1ffd
Reviewed-on: https://skia-review.googlesource.com/6561
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
29 files changed