Exposing NQE on the Browser UI thread

chrome/browser/net/nqe/ui_network_quality_estimator_service.h

+// 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.
+
+#ifndef CHROME_BROWSER_NET_NQE_UI_NETWORK_QUALITY_ESTIMATOR_SERVICE_H_
+#define CHROME_BROWSER_NET_NQE_UI_NETWORK_QUALITY_ESTIMATOR_SERVICE_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "net/nqe/network_quality_estimator.h"
+
+class Profile;
+
+namespace chrome_browser_net {

[mmenke, 2016/07/20 17:11:33]

The currently preferred style is not to use the chrome_browser_net namespace
(Current usage is inconsistent, but was a thread about this a while back that
arrived at a consensus not to use namespaces for subdirectories of chrome)

[RyanSturm, 2016/07/20 17:37:38]

Done.

+
+// UI service to determine the current EffectiveConnectionType.
+class UINetworkQualityEstimatorService : public KeyedService {
+ public:
+  explicit UINetworkQualityEstimatorService(Profile* profile);
+  ~UINetworkQualityEstimatorService() override;
+
+  // The current EffectiveConnectionType.
+  net::NetworkQualityEstimator::EffectiveConnectionType
+  GetEffectiveConnectionType() const;
+
+ private:
+  class IONetworkQualityObserver;
+
+  // KeyedService implementation:
+  void Shutdown() override;
+
+  // Called when the EffectiveConnectionType has updated to |type|.
+  // NetworkQualityEstimator::EffectiveConnectionType is an estimate of the
+  // quality of the network that may differ from the actual network type
+  // reported by NetworkchangeNotifier::GetConnectionType.
+  void EffectiveConnectionTypeChanged(
+      net::NetworkQualityEstimator::EffectiveConnectionType type);
+
+  // The current EffectiveConnectionType.
+  net::NetworkQualityEstimator::EffectiveConnectionType type_;
+
+  // IO thread based observer that is owned by this service. Created on the UI
+  // thread, but used and deleted on the IO thread.
+  IONetworkQualityObserver* io_observer_;
+  base::ThreadChecker thread_checker_;
+
+  base::WeakPtrFactory<UINetworkQualityEstimatorService> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(UINetworkQualityEstimatorService);
+};
+
+}  // namespace chrome_browser_net
+
+#endif  // CHROME_BROWSER_NET_NQE_UI_NETWORK_QUALITY_ESTIMATOR_SERVICE_H_