Split NQE to multiple files

net/nqe/network_quality.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 NET_NQE_NETWORK_QUALITY_H_
+#define NET_NQE_NETWORK_QUALITY_H_
+
+#include <stdint.h>
+
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "net/base/net_export.h"
+
+namespace net {
+
+namespace nqe {
+
+namespace internal {
+
+// Returns the RTT value to be used when the valid RTT is unavailable. Readers
+// should discard RTT if it is set to the value returned by |InvalidRTT()|.
+NET_EXPORT_PRIVATE base::TimeDelta InvalidRTT();
+
+// Throughput is set to |kInvalidThroughput| if a valid value is
+// unavailable. Readers should discard throughput value if it is set to
+// |kInvalidThroughput|.
+const int32_t kInvalidThroughput = 0;
+
+// NetworkQuality is used to cache the quality of a network connection.
+class NET_EXPORT_PRIVATE NetworkQuality {
+ public:
+  NetworkQuality();
+  // |rtt| is the estimate of the round trip time.
+  // |downstream_throughput_kbps| is the estimate of the downstream
+  // throughput in kilobits per second.
+  NetworkQuality(const base::TimeDelta& rtt,
+                 int32_t downstream_throughput_kbps);
+  NetworkQuality(const NetworkQuality& other);
+  ~NetworkQuality();
+
+  NetworkQuality& operator=(const NetworkQuality& other);
+
+  // Returns the estimate of the round trip time at the HTTP layer.
+  const base::TimeDelta& rtt() const { return rtt_; }
+
+  // Returns the estimate of the downstream throughput in Kbps (Kilobits per
+  // second).
+  int32_t downstream_throughput_kbps() const {
+    return downstream_throughput_kbps_;
+  }
+
+ private:
+  // Estimated round trip time at the HTTP layer.
+  base::TimeDelta rtt_;
+
+  // Estimated downstream throughput in kilobits per second.
+  int32_t downstream_throughput_kbps_;
+};
+
+}  // namespace internal
+
+}  // namespace nqe
+
+}  // namespace net
+
+#endif  // NET_NQE_NETWORK_QUALITY_H_