Adding observer functionality to UINetworkQualityService

chrome/browser/net/nqe/ui_network_quality_estimator_service.cc

Index: chrome/browser/net/nqe/ui_network_quality_estimator_service.cc
diff --git a/chrome/browser/net/nqe/ui_network_quality_estimator_service.cc b/chrome/browser/net/nqe/ui_network_quality_estimator_service.cc
index 6e00352acd3e916b9f5fc6170364fc3b2866164e..3208ce46583b2147c8b4177df054151774bdc4da 100644
--- a/chrome/browser/net/nqe/ui_network_quality_estimator_service.cc
+++ b/chrome/browser/net/nqe/ui_network_quality_estimator_service.cc
@@ -200,26 +200,40 @@ void UINetworkQualityEstimatorService::Shutdown() {
     DCHECK(deleted);
     // Silence unused variable warning in release builds.
     (void)deleted;
   }
 }
 
 void UINetworkQualityEstimatorService::EffectiveConnectionTypeChanged(
     net::EffectiveConnectionType type) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   type_ = type;
+  for (auto& observer : effective_connection_type_observer_list_)
+    observer.OnEffectiveConnectionTypeChanged(type);
+}
+
+void UINetworkQualityEstimatorService::AddEffectiveConnectionTypeObserver(
+    net::NetworkQualityEstimator::EffectiveConnectionTypeObserver* observer) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  effective_connection_type_observer_list_.AddObserver(observer);
+}
+
+void UINetworkQualityEstimatorService::RemoveEffectiveConnectionTypeObserver(
+    net::NetworkQualityEstimator::EffectiveConnectionTypeObserver* observer) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  effective_connection_type_observer_list_.RemoveObserver(observer);
 }
 
 void UINetworkQualityEstimatorService::SetEffectiveConnectionTypeForTesting(
     net::EffectiveConnectionType type) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  type_ = type;
+  EffectiveConnectionTypeChanged(type);
 }
 
 net::EffectiveConnectionType
 UINetworkQualityEstimatorService::GetEffectiveConnectionType() const {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   return type_;
 }
 
 // static
 void UINetworkQualityEstimatorService::RegisterProfilePrefs(