NQE: Add net log event if the metric changes substantially

net/nqe/network_quality_estimator_unittest.cc

Index: net/nqe/network_quality_estimator_unittest.cc
diff --git a/net/nqe/network_quality_estimator_unittest.cc b/net/nqe/network_quality_estimator_unittest.cc
index 4c68ae0fcf5ab01687cdff639eead29c8dc87c4f..61b92e37477923bc7eeff305012c71a2f4df9725 100644
--- a/net/nqe/network_quality_estimator_unittest.cc
+++ b/net/nqe/network_quality_estimator_unittest.cc
@@ -411,7 +411,7 @@ TEST(NetworkQualityEstimatorTest, Caching) {
   // |observer| should be notified as soon as it is added.
   base::RunLoop().RunUntilIdle();
   EXPECT_EQ(1U, observer.effective_connection_types().size());
-  EXPECT_EQ(
+  EXPECT_LE(

[RyanSturm, 2017/03/03 22:10:21]

why is this LE now?

[tbansal1, 2017/03/03 23:06:35]

With this CL, it is difficult to precisely determine the number of entries that
will be added to the net log.

       2, estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED));
 
   estimator.SimulateNetworkChange(