tabs: Need better way to programmatically focus (not select) a tab.

[topherfangio]

Actual Behavior:

• What is the issue? * Currently, there is no easy way to focus a particular tab and have the styling applied properly.
• What is the expected behavior? I should be able to call myTab.focus() or set the md-focused-index property of the <md-tabs> component to programmatically focus a tab.

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue: http://codepen.io/topherfangio/pen/dpkGQk?editors=1010
• Details: Currently, in order to focus a tab, you have to fetch the mdTabs controller and modify the ctrl.lastClick and ctrl.focusIndex properties to focus the appropriate tab.

Angular Versions: *

• Angular Version: All
• Angular Material Version: 1.1.1

Additional Information:

• Browser Type: *
• Browser Version: *
• OS: *
• Stack Traces:

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[Splaktar]

Based on the selected API being md-selected, there should probably be a md-focused API for md-tabs.

It would be nice to know more about the use case here, but it still looks like a valid request.