limit discrete path effect iterations

R=fmalita@google.com, reed@google.com
Bug: skia:7737
Change-Id: I339548f7a39618d7559182487e8969d591953b89
Reviewed-on: https://skia-review.googlesource.com/115659
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
1 file changed