Fix crash in bench when "--mode record" is used

R=mtklein@google.com

Author: robertphillips@google.com

Review URL: https://codereview.chromium.org/150633008

git-svn-id: http://skia.googlecode.com/svn/trunk@13310 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed