Adding int cast to prevent warning

BUG=skia:
R=fmalita@google.com, fmalita@chromium.org, bsalomon@google.com, bsalomon@chromium.org

Author: sugoi@chromium.org

Review URL: https://codereview.chromium.org/149463009

git-svn-id: http://skia.googlecode.com/svn/trunk@13285 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed