Add workaround for Xoom crashing after discard removed from shader.

R=robertphillips@google.com
TBR=robertphillips@google.com

BUG=skia:2149

Author: bsalomon@google.com

Review URL: https://codereview.chromium.org/133703016

git-svn-id: http://skia.googlecode.com/svn/trunk@13373 2bbb7eff-a529-9590-31e7-b0007b416f81
3 files changed