ccpr: Add a context option to disable ccpr

TBR=bsalomon@google.com

Bug: skia:856404
Change-Id: Icc6f3d1e7ef97f1853427a3b1cdd405961e6ac26
Reviewed-on: https://skia-review.googlesource.com/137763
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
2 files changed