Closing Dialog using escape only works after initial open w/ button focused

[rosslavery]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Dialog should close when escape is pressed, regardless of what is in focus.

What is the current behavior?

If the user interacts with the dialog in any way (causing the initial focus to be lost), pressing escape no longer closes the dialog.

What are the steps to reproduce?

• Go to https://material.angular.io/components/component/dialog
• Launch the dialog
• Click anywhere inside the dialog besides the buttons, causing the first button to lose focus
• Press escape -- the dialog does not close

Providing a Plunker (or similar) is the best way to get the team to see your issue.
See: https://material.angular.io/components/component/dialog

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

A user should be able to press escape to close the dialog at any time.

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

Seemingly all

Is there anything else we should know?

No

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