Upstream http://cl/374717449

lib/utils/telemetry.d.ts

@@ -1,5 +1,12 @@
 // tslint:disable:variable-name Describing an API that's defined elsewhere.
 
+import {PolymerElementConstructor} from '../../interfaces';
+
+export {PolymerElementConstructor} from '../../interfaces';
+
+/** Array of Polymer element classes that have been finalized. */
+export const registrations: PolymerElementConstructor[];
+
 export {incrementInstanceCount};
 
 declare function incrementInstanceCount(): void;
@@ -19,5 +26,3 @@ export {dumpRegistrations};
  * Logs all elements registered with an `is` to the console.
  */
 declare function dumpRegistrations(): void;
-
-import {PolymerElementConstructor} from '../../interfaces';