Add in-memory caching of network quality estimates across network changes.

net/base/network_quality.h

 // Copyright 2015 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 NET_BASE_NETWORK_QUALITY_H_
 #define NET_BASE_NETWORK_QUALITY_H_
 
 #include <stdint.h>
 
 #include "base/time/time.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
 // API that is used to report the network quality of a network connection as
 // estimated by the NetworkQualityEstimator.
 class NET_EXPORT_PRIVATE NetworkQuality {
  public:
   // |rtt| is the estimate of the round trip time.
   // |downstream_throughput_kbps| is the estimate of the downstream throughput.
   NetworkQuality(const base::TimeDelta& rtt,
                  int32_t downstream_throughput_kbps);
 

[pauljensen, 2015/06/23 11:52:10]

remove new line

[tbansal1, 2015/07/13 21:21:26]

Done.

+  NetworkQuality(const NetworkQuality& other);
+

[pauljensen, 2015/06/23 11:52:10]

remove new line

   ~NetworkQuality();
 
+  NetworkQuality& operator=(const NetworkQuality& other);
+
   // Returns the estimate of the round trip time.
   const base::TimeDelta& rtt() const { return rtt_; }
 
   // Returns the estimate of the downstream throughput in Kbps (Kilo bits per
   // second).
   int32_t downstream_throughput_kbps() const {
     return downstream_throughput_kbps_;
   }
 
  private:
   // Estimated round trip time.
-  const base::TimeDelta rtt_;
+  base::TimeDelta rtt_;
 
   // Estimated downstream throughput in Kbps.
-  const int32_t downstream_throughput_kbps_;
+  int32_t downstream_throughput_kbps_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_QUALITY_H_