Currently uses actions for inserting media into a post as an example (hence the raw text). To test a workflow that supports multiple selection, run the following in your browser's JavaScript console:
wp.media({ multiple: true });
see #21390, #21808.
git-svn-id: http://core.svn.wordpress.org/trunk@21769 1a063a9b-81f0-0310-95a4-ce76da25c4cd