Sometimes travis test will fail on Android 4.4 because setInterval

[JiaLiPassion]

I always run into travis build fail(for example, this build because one specified case in setInterval.spec.ts
can be simplified as the following case.

  intervalCount = 0;
  id = setInterval(() => {
    intervalCount ++;
    setTimeout(() => {
       expect(intervalCount).toBe(1);
      clearInterval(id);
    });
  }, 10);

In most cases, the interval will only run once, but in Android 4.4, for some reasons, the interval will run twice, I check the setTimeout/setInterval document online, that setInterval may execute at once if the setInterval callback run long enough, so it may have a chance to run 2nd time before setTimeout.