Fix convexicator bug

Fix convexicator bug

BUG=crbug.com/412640

Committed: https://skia.googlesource.com/skia/+/c506e3007e53fe7d1a77991de11fdb50a86fd532

[robertphillips, 2014-09-15 16:19:15]

robertphillips@google.com changed reviewers:
+ bsalomon@google.com

[robertphillips, 2014-09-15 20:39:27]

New Version

[bsalomon, 2014-09-15 20:59:30]

lgtm

[robertphillips, 2014-09-15 21:06:43]

robertphillips@google.com changed reviewers:
+ caryclark@google.com

[caryclark, 2014-09-16 16:06:28]

lgtm

[robertphillips, 2014-09-16 16:11:53]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-09-16 16:12:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/573763002/2

[commit-bot: I haz the power, 2014-09-16 16:17:48]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-16 16:17:49]

Try jobs failed on following builders:
  Build-Ubuntu13.10-Clang-x86_64-Debug-Trybot on tryserver.skia
(http://108.170.220.76:10117/builders/Build-Ubuntu13.10-Clang-x86_64-Debug-Try...)

[robertphillips, 2014-09-16 16:35:52]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-09-16 16:36:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/573763002/50001

[commit-bot: I haz the power, 2014-09-16 16:43:37]

Committed patchset #4 (id:50001) as c506e3007e53fe7d1a77991de11fdb50a86fd532