Bug: md-toolbar should have role of toolbar

[bsteffl]

Bug:

Md-toolbar should have role="toolbar"

What is the expected behavior?

WCAG Guidelines

What is the current behavior?

No toolbar role is announced. Would be nice to also provide keyboard functionality for
Left Arrow and Right Arrow.

What are the steps to reproduce?

<md-toolbar>
  <span>First Row</span>

  <md-toolbar-row>
    <span>Second Row</span>
  </md-toolbar-row>

  <md-toolbar-row>
    <span>Third Row</span>
  </md-toolbar-row>
</md-toolbar>

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

Meet accessibility requirements

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

2.0.0-beta.1

[devversion]

@bsteffl Thanks for the great issue reports!

Regarding keyboard interaction, I don't think that the toolbar should be responsible for such things. The toolbar is meant to be very simple and should just follow the design guidelines.

[bsteffl]

@devversion I appreciate your support for accessibility and being inclusive. Keyboard users will still have access to buttons via tabbing so not supporting keyboard actions works too. When I included that I was just thinking about how native OS toolbars work and users understanding of those. Thank you for your contributions.

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