As a content author, I want to use search features in a choose dialog so that I can find the external content item I am looking for.

Acceptance criteria:

• Author can use a search interface in a chooser dialog.
• At a minimum they can do a text-based search. (Additional filtering and sorting controls would be useful.) 
• Works with light development.

External content systems (like PIM and DAM) can hold 1000's of content items, it can be impossible for an author to find or discover a content item. A search feature is necessary to enable this.

Note: Probably a findbar search results supplier could be leveraged to implement this.