rebaseline.py: add --bugs and --unreviewed flags
BUG=skia:1569
R=borenet@google.com

Review URL: https://codereview.chromium.org/23478011

git-svn-id: http://skia.googlecode.com/svn/trunk@11058 2bbb7eff-a529-9590-31e7-b0007b416f81
9 files changed