Bug: Focus still on "open dialog" button after clicked

[xuanshenbo]

Bug, feature request, or proposal:

Bug

What are the steps to reproduce?

Use the doc site example: https://material.angular.io/components/dialog/examples
Set focus on the "Launch dialog" button, and hit Enter key multiple times as fast as you can, multiple dialogs will show

What is the expected behavior?

Only one dialog should show

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

Angular Material 2.0.0-beta.8

Is there anything else we should know?

The reason obviously is because the dialog is not yet initiated immediately after hitting Enter , therefore focus is still on the button. Not sure how we can resolve this.

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