Adds bench expectations to expectations/bench; fixes bench alert test's dependency on script line number.

BUG=skia:2307
NOTRY=true
R=borenet@google.com

Author: bensong@google.com

Review URL: https://codereview.chromium.org/214913005

git-svn-id: http://skia.googlecode.com/svn/trunk@13979 2bbb7eff-a529-9590-31e7-b0007b416f81
8 files changed