Add NeedsRebaseline for fixing pixel noise.

TBR=rafaelw@chromium.org
BUG=none

Review URL: https://codereview.chromium.org/25684003

git-svn-id: svn://svn.chromium.org/blink/trunk@158782 bbb929c8-8fbe-4397-9dbb-9b2b20218538