compat(chip): add mat-compatible chip input event (#7184)

Author: andrewseguin

src/lib/chips/chip-input.ts

@@ -68,6 +68,8 @@ export class MdChipInput {
   @Output('mdChipInputTokenEnd')
   chipEnd = new EventEmitter<MdChipInputEvent>();
 
+  @Output('matChipInputTokenEnd') _matChipInputTokenEnd = this.chipEnd;
+
   @Input('matChipInputFor')
   set matChipList(value: MdChipList) { this.chipList = value; }