[md-nav-list][bug] Keyboard support

[chouclee]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

#1599
nav-list should support keyboards events like keyup, keydown.

What is the current behavior?

Only works when scroll bar can scroll.

What are the steps to reproduce?

http://plnkr.co/edit/7KTO8hIAgb9VO7oubNoF?p=preview
Click 'AB'. Keyup will not work. Keydown works until 'BB'

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

Fully support of keyboards events, at least for keyup, keydown and enter.

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

Angular 2.1.0
Material: Master
OS: MacOS 10.11.6

Is there anything else we should know?

Nope

[jelbourn]

@marcysutton For a list of anchors, should the interaction just to be to rely on the browser's default behavior (tabbing through them vs. having arrow-key shortcuts)?

(md-nav-list is just a list of anchor elements)

[marcysutton]

@jelbourn yes, that is correct! Although if those anchors have ARIA menu roles, then the expected navigation behavior is to use the arrow keys with the whole menu as one tab stop. But I think you know that already :)

[jelbourn]

Going to close this as working-as-intended then; the a11y for the nav-list determines the interaction here.

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