Record network quality UMA metrics on main frame requests

net/nqe/network_quality_estimator.h

Index: net/nqe/network_quality_estimator.h
diff --git a/net/nqe/network_quality_estimator.h b/net/nqe/network_quality_estimator.h
index 2444ba77069066721c2402558976d862b6bfb934..a5be53f24f0e6e31f7141044bce826e5551a7a0c 100644
--- a/net/nqe/network_quality_estimator.h
+++ b/net/nqe/network_quality_estimator.h
@@ -327,6 +327,9 @@ class NET_EXPORT_PRIVATE NetworkQualityEstimator
   // Records UMA when there is a change in connection type.
   void RecordMetricsOnConnectionTypeChanged() const;
 
+  // Records UMA on main frame requests.
+  void RecordMetricsOnMainFrameRequest() const;
+
   // Records a downstream throughput observation to the observation buffer if
   // a valid observation is available. |downstream_kbps| is the downstream
   // throughput in kilobits per second.