Adds bench rebase tools to experimental for version control and self update.

BUG=skia:
NOTRY=true
R=kelvinly@google.com
TBR=kelvinly@google.com

Author: bensong@google.com

Review URL: https://codereview.chromium.org/296453016

git-svn-id: http://skia.googlecode.com/svn/trunk@14833 2bbb7eff-a529-9590-31e7-b0007b416f81
2 files changed