Factor out NetworkID and caching mechanism from n_q_e.{h,cc}

net/nqe/network_quality.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 "net/nqe/network_quality.h"
 
 namespace net {
 
 namespace nqe {
 
@@ skipping 22 matching lines @@
 
 NetworkQuality::~NetworkQuality() {}
 
 NetworkQuality& NetworkQuality::operator=(const NetworkQuality& other) {
   http_rtt_ = other.http_rtt_;
   transport_rtt_ = other.transport_rtt_;
   downstream_throughput_kbps_ = other.downstream_throughput_kbps_;
   return *this;
 }
 
+bool NetworkQuality::operator==(const NetworkQuality& other) const {
+  return http_rtt_ == other.http_rtt_ &&
+         transport_rtt_ == other.transport_rtt_ &&
+         downstream_throughput_kbps_ == other.downstream_throughput_kbps_;
+}
+
 }  // namespace internal
 
 }  // namespace nqe
 
 }  // namespace net