The next step will be to generate help automatically and remove the command
check loop.

TEST=not much
BUG=me

Review URL: http://codereview.chromium.org/2096003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@47291 0039d316-1c4b-4281-b951-d872f2087c98