Chip-list overrides initial chip selected state

[jelbourn]

Say you have a template like this:

<mat-chip-list>
  <mat-chip *ngFor="let i of items" selected="true"> {{i}} </mat-chip>
</mat-chip-list>

Because of this async behavior in chip-list:
https://github.com/angular/material2/blob/3571f68a2de0833ee4741af8a0eb24d1da174f38/src/lib/chips/chip-list.ts#L574-L577

The individual chip selection gets overwritten by the chip-list on init.

@tinayuangao we should find a way to avoid using Promise.resolve here

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