File tab-header.spec.ts

src/material/tabs/tab-header.spec.ts:None–None

import {Dir, Direction} from '@angular/cdk/bidi';
import {END, ENTER, HOME, LEFT_ARROW, RIGHT_ARROW, SPACE} from '@angular/cdk/keycodes';
import {MutationObserverFactory} from '@angular/cdk/observers';
import {SharedResizeObserver} from '@angular/cdk/observers/private';