Method constructor

tfjs-core/src/profiler_test.ts:28–30

(
      private delayMs: number, private queryTimeMs: number,
      private extraInfo: string)

class TestBackendTimer implements BackendTimer {
  private counter = 1;
  constructor(
      private delayMs: number, private queryTimeMs: number,
      private extraInfo: string) {}

  timerAvailable() {
    return true;