add flag to hide deprecated clipops

needs this to land first
https://codereview.chromium.org/2877493002/#

Bug: skia:3191
Change-Id: Iff5271064877c4e96353d3564464f513eaad0bb5
Reviewed-on: https://skia-review.googlesource.com/16365
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Mike Reed <reed@google.com>
7 files changed