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

net/base/network_quality.cc

 // 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.
 
 #include "net/base/network_quality.h"
 
 #include "base/logging.h"
 
 namespace net {
 
 NetworkQuality::NetworkQuality(const base::TimeDelta& rtt,
                                int32_t downstream_throughput_kbps)
     : rtt_(rtt), downstream_throughput_kbps_(downstream_throughput_kbps) {
   DCHECK_GE(rtt_, base::TimeDelta());
   DCHECK_GE(downstream_throughput_kbps_, 0);
 }
 
+NetworkQuality::NetworkQuality(const NetworkQuality& other)
+    : rtt_(other.rtt_),
+      downstream_throughput_kbps_(other.downstream_throughput_kbps_) {
+}
+
+NetworkQuality& NetworkQuality::operator=(const NetworkQuality& other) {
+  rtt_ = other.rtt_;
+  downstream_throughput_kbps_ = other.downstream_throughput_kbps_;
+  return *this;
+}
+
 NetworkQuality::~NetworkQuality() {
 }
 
 }  // namespace net