Chip input placeholder issue with async chips update

[merobal]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Refresh the state (including placeholder) automatically on async chips update.

What is the current behavior?

The placeholder remains there if chips are updated async and floatPlaceholder is set to "never". (State refreshes and placeholder disappears when I click inside input.)

What are the steps to reproduce?

https://plnkr.co/edit/WHW38I60XQkeo6Bl9KA2?p=preview

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

Latest on Plunker.

Is there anything else we should know?

Maybe related: #8448

[jelbourn]

@tinayuangao is this the same as #8448? If so, feel free to close

[merobal]

I marked that as related since it's about placeholder too, there is missing stateChange on ngOnChange I guess in this case.

[merobal]

@jelbourn @tinayuangao I can confirm it's still an issue with rc.1:
https://plnkr.co/edit/WHW38I60XQkeo6Bl9KA2?p=preview

[merobal]

@tinayuangao Will #9762 solve this issue?

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