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We don't actually call this code yet, but we're going to need this code in
order to demo a spinning cube. I've verified that this code draws a cube when
called directly from mojo_shell. It should work when called from sample_app
once we figure out how we want to expose GL to Mojo apps.

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/61423003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233309 0039d316-1c4b-4281-b951-d872f2087c98