Create GrXferProcessor while doing GrProcessorSet analysis.


Bug: skia:
Change-Id: I62a628f9c0536ffb05c8f9d0c9ded5657f93b48e
Reviewed-on: https://skia-review.googlesource.com/11482
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
17 files changed