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: https://develop.svn.wordpress.org/trunk@21769 602fd350-edb4-49c9-b593-d223f7449a82