Move Network Quality Estimator files to //net/nqe

net/base/socket_performance_watcher.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_SOCKET_PERFORMANCE_WATCHER_H_
-#define NET_BASE_SOCKET_PERFORMANCE_WATCHER_H_
-
-#include "net/base/net_export.h"
-
-namespace base {
-class TimeDelta;
-}  // namespace base
-
-namespace net {
-
-// SocketPerformanceWatcher is the base class for recording and aggregating
-// per-socket statistics. SocketPerformanceWatcher must be used on a single
-// thread.
-class NET_EXPORT_PRIVATE SocketPerformanceWatcher {
- public:
-  virtual ~SocketPerformanceWatcher() {}
-
-  // Returns true if |this| SocketPerformanceWatcher is interested in receiving
-  // an updated RTT estimate (via OnUpdatedRTTAvailable).
-  virtual bool ShouldNotifyUpdatedRTT() const = 0;
-
-  // Notifies |this| SocketPerformanceWatcher of updated transport layer RTT
-  // from this device to the remote transport layer endpoint. This method is
-  // called immediately after the observation is made, hence no timestamp.
-  // There is no guarantee that OnUpdatedRTTAvailable will be called every time
-  // an updated RTT is available as the socket may throttle the
-  // OnUpdatedRTTAvailable call for various reasons, including performance.
-  virtual void OnUpdatedRTTAvailable(const base::TimeDelta& rtt) = 0;
-
-  // Notifies that |this| watcher will be reused to watch a socket that belongs
-  // to a different transport layer connection. Note: The new connection shares
-  // the same protocol as the previously watched socket.
-  virtual void OnConnectionChanged() = 0;
-};
-
-}  // namespace net
-
-#endif  // NET_BASE_SOCKET_PERFORMANCE_WATCHER_H_