NQE: Notify observer as soon as it is added

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 4368f41202283944447f07344b7dc6c1346801c0..9680d590e7a78161eaed5d8be593f250b5bb7ea5 100644
--- a/net/nqe/network_quality_estimator.h
+++ b/net/nqe/network_quality_estimator.h
@@ -214,7 +214,9 @@ class NET_EXPORT NetworkQualityEstimator
       const base::TimeTicks& start_time) const;
 
   // Adds |observer| to the list of effective connection type observers. Must be
-  // called on the IO thread.
+  // called on the IO thread. |observer| would be notified of the current
+  // effective connection type in the next message pump, if it is still
+  // registered as an observer.
   void AddEffectiveConnectionTypeObserver(
       EffectiveConnectionTypeObserver* observer);
 
@@ -224,7 +226,9 @@ class NET_EXPORT NetworkQualityEstimator
       EffectiveConnectionTypeObserver* observer);
 
   // Adds |observer| to the list of RTT and throughput estimate observers. Must
-  // be called on the IO thread.
+  // be called on the IO thread. |observer| would be notified of the current RTT
+  // and throughput estimates in the next message pump, if it is still
+  // registered as an observer.
   void AddRTTAndThroughputEstimatesObserver(
       RTTAndThroughputEstimatesObserver* observer);
 
@@ -492,6 +496,16 @@ class NET_EXPORT NetworkQualityEstimator
   // Notifies the observers of RTT or throughput estimates computation.
   void NotifyObserversOfRTTOrThroughputComputed() const;
 
+  // Notifies |observer| of the current effective connection type if |observer|
+  // is still registered as an observer.
+  void NotifyEffectiveConnectionTypeObserverIfPresent(
+      EffectiveConnectionTypeObserver* observer) const;
+
+  // Notifies |observer| of the current RTT and throughput if |observer| is
+  // still registered as an observer.
+  void NotifyRTTAndThroughputEstimatesObserverIfPresent(
+      RTTAndThroughputEstimatesObserver* observer) const;
+
   // Records NQE accuracy metrics. |measuring_duration| should belong to the
   // vector returned by AccuracyRecordingIntervals().
   // RecordAccuracyAfterMainFrame should be called |measuring_duration| after a