This will allow ANGLE to have a recursible deps-file in their repo instead of
relying on chromium's DEPS file to specify an accurate dependency for itself.

Previously: https://chromiumcodereview.appspot.com/1919103003/

R=agable@chromium.org, dpranke@chromium.org, jmadill@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/1948853002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300446 0039d316-1c4b-4281-b951-d872f2087c98