IMPORTANT: See bug http://crbug.com/605563#c3 for deployment and emergency roll-back plan.

This patch is first of a series. It provides a cleaner and generic way to apply patches to non-root of first solution.

R=phajdan.jr@chromium.org,machenbach@chromium.org
BUG=605563

Review URL: https://codereview.chromium.org/1917433002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300141 0039d316-1c4b-4281-b951-d872f2087c98