This CL allows passing the Rietveld URL to git cl patch along with the
CL number or patch URL.

Review URL: https://codereview.chromium.org/1363043002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@296889 0039d316-1c4b-4281-b951-d872f2087c98