Add EffectiveConnectionType enum to the system profile proto

components/metrics/net/network_metrics_provider.h

Index: components/metrics/net/network_metrics_provider.h
diff --git a/components/metrics/net/network_metrics_provider.h b/components/metrics/net/network_metrics_provider.h
index da47689d2746187f5e7ba4e874a07c867327139b..98da9a606f3cb11754294d7923fa86c21f635373 100644
--- a/components/metrics/net/network_metrics_provider.h
+++ b/components/metrics/net/network_metrics_provider.h
@@ -10,11 +10,17 @@
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/metrics/histogram_base.h"
+#include "base/threading/thread_checker.h"
 #include "components/metrics/metrics_provider.h"
 #include "components/metrics/net/wifi_access_point_info_provider.h"
 #include "components/metrics/proto/system_profile.pb.h"
 #include "net/base/network_change_notifier.h"
 #include "net/base/network_interfaces.h"
+#include "net/nqe/effective_connection_type.h"
+
+namespace net {
+class NetworkQualityEstimator;
+}
 
 namespace metrics {
 
@@ -24,12 +30,43 @@ class NetworkMetricsProvider
     : public MetricsProvider,
       public net::NetworkChangeNotifier::ConnectionTypeObserver {
  public:
+  // Class that provides |this| with the network quality estimator.
+  class NetworkQualityEstimatorProvider {
+   public:
+    virtual ~NetworkQualityEstimatorProvider() {}
+
+    // Synchronously provides network quality estimator by calling |callback|.
+    // |callback| is run synchronously on the same task runner on which
+    // ProvideEstimator() was called.
+    virtual void ProvideEstimator(
+        const base::Callback<void(net::NetworkQualityEstimator*)>&
+            callback) = 0;
+
+   protected:
+    NetworkQualityEstimatorProvider() {}
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(NetworkQualityEstimatorProvider);
+  };
+
   // Creates a NetworkMetricsProvider, where |io_task_runner| is used to post
-  // network info collection tasks.
-  explicit NetworkMetricsProvider(base::TaskRunner* io_task_runner);
+  // network info collection tasks.  |network_quality_estimator_provider|
+  // should be used on  |network_quality_task_runner|, and should be set
+  // if it is useful to attach the quality of the network to the metrics report.
+  NetworkMetricsProvider(const scoped_refptr<base::SequencedTaskRunner>&
+                             network_quality_task_runner,

[Alexei Svitkine (slow), 2017/01/04 15:18:59]

Can the task runner ctor param be avoided and just be something that the
NetworkQualityEstimatorProvider returns?

[tbansal1, 2017/01/04 20:47:54]

Good point. Done.

+                         std::unique_ptr<NetworkQualityEstimatorProvider>
+                             network_quality_estimator_provider,
+                         base::TaskRunner* io_task_runner);
+
   ~NetworkMetricsProvider() override;
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(NetworkMetricsProviderTest, EffectiveConnectionType);
+
+  // Listens to the changes in the effective conection type.
+  class EffectiveConnectionTypeObserver;
+
   // MetricsProvider:
   void ProvideGeneralMetrics(ChromeUserMetricsExtension* uma_proto) override;
   void ProvideSystemProfileMetrics(SystemProfileProto* system_profile) override;
@@ -41,6 +78,8 @@ class NetworkMetricsProvider
   SystemProfileProto::Network::ConnectionType GetConnectionType() const;
   SystemProfileProto::Network::WifiPHYLayerProtocol GetWifiPHYLayerProtocol()
       const;
+  SystemProfileProto::Network::EffectiveConnectionType
+  GetEffectiveConnectionType() const;
 
   // Posts a call to net::GetWifiPHYLayerProtocol on the blocking pool.
   void ProbeWifiPHYLayerProtocol();
@@ -57,6 +96,10 @@ class NetworkMetricsProvider
   // Logs metrics that are functions of other metrics being uploaded.
   void LogAggregatedMetrics();
 
+  // Notifies |this| that the effective connection type of the current network
+  // has changed to |type|.
+  void OnEffectiveConnectionTypeChanged(net::EffectiveConnectionType type);
+
   // Task runner used for blocking file I/O.
   base::TaskRunner* io_task_runner_;
 
@@ -79,6 +122,28 @@ class NetworkMetricsProvider
   base::HistogramBase::Count total_aborts_;
   base::HistogramBase::Count total_codes_;
 
+  // Provides the network quality estimator. May be null.
+  std::unique_ptr<NetworkQualityEstimatorProvider>
+      network_quality_estimator_provider_;
+
+  // Listens to the changes in the effective connection type. Initialized and
+  // destroyed using |network_quality_task_runner_|. May be null.
+  std::unique_ptr<EffectiveConnectionTypeObserver>
+      effective_connection_type_observer_;
+
+  // Task runner using which |effective_connection_type_observer_| is
+  // initialized and destroyed. May be null.
+  scoped_refptr<base::SequencedTaskRunner> network_quality_task_runner_;
+
+  // Last known effective connection type.
+  net::EffectiveConnectionType effective_connection_type_;
+
+  // True if |effective_connection_type_| changed during the lifetime of the
+  // log.
+  bool effective_connection_type_is_ambiguous_;
+
+  base::ThreadChecker thread_checker_;
+
   base::WeakPtrFactory<NetworkMetricsProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkMetricsProvider);