Merge branch 'stepper-states' of github.com:arodr967/material2 into stepper-states

Author: arodr967

src/cdk/stepper/stepper.ts

@@ -98,6 +98,9 @@ export class CdkStep implements OnChanges {
   /** Plain text label of the step. */
   @Input() label: string;
 
+  /** Alert message when there's an error. */
+  @Input() alertMessage: string;
+
   /** Aria label for the tab. */
   @Input('aria-label') ariaLabel: string;