Add a tooling flag for path mask caching

Adds the flag and a disables caching on the CCPR bots.

Bug: skia:
Change-Id: Icb85e77f89634dda1d419dacac5b8a93340723f0
Reviewed-on: https://skia-review.googlesource.com/59740
Reviewed-by: Eric Boren <borenet@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
10 files changed