Correction, it is flaky locally.  Oddly, it failed on 3 bots at once (after being green for 10 runs earlier) so it might be affected by environmental factors?  Anyway, I can't find an obvious culprit, so assigning to Cronet folks.

Tarun, would you mind taking a look at this? Do you know if there's any recent change in NQE that might have caused this test failure?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/aeee178ce621bfa3a9250f749d8e54a5b42bc54d

commit aeee178ce621bfa3a9250f749d8e54a5b42bc54d
Author: aelias <aelias@chromium.org>
Date: Tue May 24 01:37:49 2016

Mark CronetUrlRequestContextTest#testRealTimeNetworkQualityObservations flaky.

This test failed once on 3 different Cronet bots, and I can also
reproduce flakiness locally.

TBR=xunjieli
NOTRY=true
BUG= 614227 

Review-Url: https://codereview.chromium.org/2005153002
Cr-Commit-Position: refs/heads/master@{#395508}

[modify] https://crrev.com/aeee178ce621bfa3a9250f749d8e54a5b42bc54d/components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestContextTest.java

I noticed this before, and I have verified that https://codereview.chromium.org/1999303002/ fixes it. I manually added android_cronet_tester on that CQ, and it looks happy.

Can you look at the CL, ad if it looks good, we can push it to CQ?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/86d66363a9aad84556298c81c4a5af935d67d03b

commit 86d66363a9aad84556298c81c4a5af935d67d03b
Author: tbansal <tbansal@chromium.org>
Date: Fri May 27 16:42:17 2016

Fix flaky NQE cronet test

Example of a flaky run from testbot:
https://build.chromium.org/p/tryserver.chromium.android/builders/android_cronet_tester/builds/168
and https://build.chromium.org/p/chromium.android/builders/Android%20Cronet%20Builder/builds/2184

A recent NQE CL changed the logic so that throughput
observations are now posted to NQE (before that CL, the
observations were available synchronously).

BUG= 614227 

Review-Url: https://codereview.chromium.org/1999303002
Cr-Commit-Position: refs/heads/master@{#396488}

[modify] https://crrev.com/86d66363a9aad84556298c81c4a5af935d67d03b/components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestContextTest.java