Components: Material chip list should support being not focusable

[mertdeg]

Bug, feature request, or proposal:

Feature request

What is the expected behavior?

I should be able to pass in an @Input() to mat-chip-list so that it doesn't have tabIndex = 0 by default. Sometimes we want to display chips within a tooltip. And we don't want user to be able to focus on individual chips.

What is the current behavior?

mat-chip-list is always focusable by default

What are the steps to reproduce?

Create mat-chip-list with non-zero chips inside

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

To increase use cases for material chip list component

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

All

[mertdeg]

@jelbourn as FYI

[jelbourn]

@tinayuangao the chip list should respect a user-provided tabIndex if there is one

[bsteffl]

This doesn't seem to make the chip appear to be not interactive when you click on the chip, it still has a ripple. Is there a way to have a readonly chip but is not disabled?

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