This script:
- searches through the last N commits to find out the hash that is
associated with the revision number.
- creates a new branch in the chromium tree, modifies the DEPS
file, commits, and uploads to Rietveld.
- create a whitespace-only commit and uploads that to to Rietveld.
BUG=
R=borenet@google.com
Review URL: https://codereview.chromium.org/123523003
git-svn-id: http://skia.googlecode.com/svn/trunk@12921 2bbb7eff-a529-9590-31e7-b0007b416f81
