Mojo: data pipe boilerplate testing (and hooking up).

I implemented the stupid boilerplate tests ... which then promptly
failed, pointing out that I had forgotten to hook up my boilerplate.
Oops.

R=sky@chromium.org

Review URL: https://codereview.chromium.org/99173008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@240473 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 240473