Re: [streams-tests] Deflake ReadableStream piping flow control test (#5662)

# [Codecov](https://codecov.io/gh/w3c/web-platform-tests/pull/5662?src=pr&el=h1) Report
> Merging [#5662](https://codecov.io/gh/w3c/web-platform-tests/pull/5662?src=pr&el=desc) into [master](https://codecov.io/gh/w3c/web-platform-tests/commit/bab7ceafdfb3f4297f060d2ecaee5f514079de9f?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/w3c/web-platform-tests/pull/5662/graphs/tree.svg?src=pr&token=DI3aecdnSC&height=150&width=650)](https://codecov.io/gh/w3c/web-platform-tests/pull/5662?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master    #5662   +/-   ##
=======================================
  Coverage   87.22%   87.22%           
=======================================
  Files          24       24           
  Lines        2418     2418           
  Branches      406      406           
=======================================
  Hits         2109     2109           
  Misses        239      239           
  Partials       70       70
```



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[Continue to review full report at Codecov](https://codecov.io/gh/w3c/web-platform-tests/pull/5662?src=pr&el=continue).
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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/w3c/web-platform-tests/pull/5662?src=pr&el=footer). Last update [bab7cea...2c2876a](https://codecov.io/gh/w3c/web-platform-tests/pull/5662?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).


View on GitHub: https://github.com/w3c/web-platform-tests/pull/5662#issuecomment-296676212

Received on Monday, 24 April 2017 13:56:19 UTC