make results_test.py work better within python unittest framework

BUG=
R=rmistry@google.com

Author: epoger@google.com

Review URL: https://codereview.chromium.org/122443006

git-svn-id: http://skia.googlecode.com/svn/trunk@12882 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed