Bug, feature request, or proposal:

Feature Request

What is the expected behavior?

The width of the autocomplete popover should be customizable

What is the current behavior?

The width is very small

What are the steps to reproduce?

Providing a Plunker (or similar) is the best way to get the team to see your issue.
Plunker template: https://goo.gl/DlHd6U

What is the use-case or motivation for changing an existing behavior?

Content of the autocomplete can vary in size

Which versions of Angular, Material, OS, browsers are affected?

Latest angular material, chrome

Is there anything else we should know?