This is the bare minimum to have fetch.py working for chromium.
The DEPS file pulls the new tools/recipes repo in, which will contain
the recipe for chromium and all other checkout recipes eventually (followup
CL coming shortly). fetch and fetch.bat simply invoke fetch.py. fetch.py
takes a recipe and some arguments on the command line, invokes the recipe
to get its instructions, and performs the actual checkout.

Currently only supports Gclient-Git-Svn checkout (the kind needed for
Chromium), but other checkout types will be pulled from annotated_checkout.py
soon.

Review URL: https://codereview.chromium.org/13463006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@192130 0039d316-1c4b-4281-b951-d872f2087c98