This is to be able to apply patches directly from rietveld for the try server.

TEST=tested on both svn and git with binary files. unit tests will follow up.
R=dpranke@chromium.org
BUG=

Review URL: http://codereview.chromium.org/6904152

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@84255 0039d316-1c4b-4281-b951-d872f2087c98