The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0924e3fb0383f04dbcf6919dcd7465137b308ba1

commit 0924e3fb0383f04dbcf6919dcd7465137b308ba1
Author: tbansal <tbansal@chromium.org>
Date: Mon Feb 06 00:39:20 2017

NQE: Record the number of RTT and throughput samples received

NetworkQualityEstimator (NQE): Record the number of RTT and throughput
samples received or synthesized.

BUG= 688879 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_cronet_tester

Review-Url: https://codereview.chromium.org/2654033010
Cr-Commit-Position: refs/heads/master@{#448198}

[modify] https://crrev.com/0924e3fb0383f04dbcf6919dcd7465137b308ba1/net/nqe/network_quality_estimator.cc
[modify] https://crrev.com/0924e3fb0383f04dbcf6919dcd7465137b308ba1/net/nqe/network_quality_estimator.h
[modify] https://crrev.com/0924e3fb0383f04dbcf6919dcd7465137b308ba1/net/nqe/network_quality_estimator_test_util.h
[modify] https://crrev.com/0924e3fb0383f04dbcf6919dcd7465137b308ba1/net/nqe/network_quality_estimator_unittest.cc
[modify] https://crrev.com/0924e3fb0383f04dbcf6919dcd7465137b308ba1/tools/metrics/histograms/histograms.xml