add pathops bench for simplify

Bug: skia:
Change-Id: Ic4aa213d5cb394f47e07cc19a5da89f7389a7c1f
Reviewed-on: https://skia-review.googlesource.com/c/163224
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Allan MacKinnon <allanmac@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
6 files changed