Plumb mixed samples through GrXPFactory::GetAnalysisProperties

Bug: skia:10419
Change-Id: I43898b0131231e2a4d1d6153e60530ba372b1c19
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/340516
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
10 files changed