Adding observer functionality to UINetworkQualityService

chrome/browser/net/nqe/ui_network_quality_estimator_service.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/net/nqe/ui_network_quality_estimator_service.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
@@ skipping 189 matching lines @@
     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(
     PrefRegistrySimple* registry) {
   registry->RegisterDictionaryPref(prefs::kNetworkQualities,
                                    PrefRegistry::LOSSY_PREF);
 }
 
 std::map<net::nqe::internal::NetworkID,
          net::nqe::internal::CachedNetworkQuality>
 UINetworkQualityEstimatorService::ForceReadPrefsForTesting() const {
   if (!prefs_manager_) {
     return std::map<net::nqe::internal::NetworkID,
                     net::nqe::internal::CachedNetworkQuality>();
   }
   return prefs_manager_->ForceReadPrefsForTesting();
 }