Add SocketWatcherFactory as a helper class to NQE

net/base/socket_performance_watcher_factory.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_FACTORY_H_
 #define NET_BASE_SOCKET_PERFORMANCE_WATCHER_FACTORY_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/net_export.h"
 
-namespace base {
-class TimeDelta;
-}  // namespace base
-
 namespace net {
 
 class SocketPerformanceWatcher;
 
 // SocketPerformanceWatcherFactory creates socket performance watcher for
 // different type of sockets.
 class NET_EXPORT_PRIVATE SocketPerformanceWatcherFactory {
  public:
   // Transport layer protocol used by the socket that are supported by
   // |SocketPerformanceWatcherFactory|.
   enum Protocol { PROTOCOL_TCP, PROTOCOL_QUIC };
 
   virtual ~SocketPerformanceWatcherFactory() {}
 
   // Creates a socket performance watcher that will record statistics for a
   // single socket that uses |protocol| as the transport layer protocol.
   // Implementations must return a valid, unique SocketRecorder for every call;
   // recorders must not be shared across calls or objects, nor is nullptr valid.
   virtual scoped_ptr<SocketPerformanceWatcher> CreateSocketPerformanceWatcher(
       const Protocol protocol) = 0;
 
-  // Called when updated transport layer RTT information is available from one
-  // of the watchers created by |this|. |protocol| is the protocol that was used
-  // by the watcher. |rtt| must be the transport layer RTT from this device to
-  // the remote transport layer endpoint. These methods are called immediately
-  // after the observation is made, hence no timestamp.
-  virtual void OnUpdatedRTTAvailable(const Protocol protocol,
-                                     const base::TimeDelta& rtt) = 0;
-
  protected:
   SocketPerformanceWatcherFactory() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SocketPerformanceWatcherFactory);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_SOCKET_PERFORMANCE_WATCHER_FACTORY_H_