Move QuicClock to quic/platform/

net/quic/core/quic_clock.h

-// Copyright (c) 2012 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_QUIC_QUIC_CLOCK_H_
-#define NET_QUIC_QUIC_CLOCK_H_
-
-#include "base/macros.h"
-#include "net/base/net_export.h"
-#include "net/quic/core/quic_time.h"
-
-namespace net {
-
-typedef double WallTime;
-
-// Clock to efficiently retrieve an approximately accurate time from an
-// EpollServer.
-class NET_EXPORT_PRIVATE QuicClock {
- public:
-  QuicClock();
-  virtual ~QuicClock();
-
-  // Returns the approximate current time as a QuicTime object.
-  virtual QuicTime ApproximateNow() const;
-
-  // Returns the current time as a QuicTime object.
-  // Note: this use significant resources please use only if needed.
-  virtual QuicTime Now() const;
-
-  // WallNow returns the current wall-time - a time that is consistent across
-  // different clocks.
-  virtual QuicWallTime WallNow() const;
-
-  // Converts |walltime| to a QuicTime relative to this clock's epoch.
-  virtual QuicTime ConvertWallTimeToQuicTime(
-      const QuicWallTime& walltime) const;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(QuicClock);
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_QUIC_CLOCK_H_