Add two-way binding on fixed material tab strip activeTabIndex.
Add two-way binding on fixed material tab strip activeTabIndex.

This allows replacing this client template:

<material-tab-strip [activeTabIndex]="activeTabIndex"
                    (tabChange)="onTabChange($event)">

with this slightly more idiomatic client template:

<material-tab-strip [(activeTabIndex)]="activeTabIndex">

PiperOrigin-RevId: 181340697

angulardart/angular_components,angulardart/angular_components,angulardart/angular_components