Add clipping options to path text bench and samples

Bug: skia:
Change-Id: I632a2fa5627ef1438d9ab451318a42d12c61b802
Reviewed-on: https://skia-review.googlesource.com/67683
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
4 files changed