Able to pull internal tools, but distinct from the source that
those tools may eventually build.

TBR=cmp@chromium.org
BUG=252226
TEST=local buildslave

Review URL: https://chromiumcodereview.appspot.com/17351008

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@209166 0039d316-1c4b-4281-b951-d872f2087c98