skpbench: add arguments for path renderer and path cache

Bug: skia:
Change-Id: If31d040b0560c23bfad31e06ef247428bf5bdb6d
Reviewed-on: https://skia-review.googlesource.com/62106
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
1 file changed