Move base to DEPS

base/time/tick_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 BASE_TIME_TICK_CLOCK_H_
-#define BASE_TIME_TICK_CLOCK_H_
-
-#include "base/base_export.h"
-#include "base/time/time.h"
-
-namespace base {
-
-// A TickClock is an interface for objects that vend TimeTicks.  It is
-// intended to be able to test the behavior of classes with respect to
-// non-decreasing time.
-//
-// See DefaultTickClock (base/time/default_tick_clock.h) for the default
-// implementation that simply uses TimeTicks::Now().
-//
-// (Other implementations that use TimeTicks::NowFromSystemTime() should
-// be added as needed.)
-//
-// See SimpleTestTickClock (base/test/simple_test_tick_clock.h) for a
-// simple test implementation.
-//
-// See Clock (base/time/clock.h) for the equivalent interface for Times.
-class BASE_EXPORT TickClock {
- public:
-  virtual ~TickClock();
-
-  // NowTicks() must be safe to call from any thread.  The caller may
-  // assume that NowTicks() is monotonic (but not strictly monotonic).
-  // In other words, the returned TimeTicks will never decrease with
-  // time, although they might "stand still".
-  virtual TimeTicks NowTicks() = 0;
-};
-
-}  // namespace base
-
-#endif  // BASE_TIME_TICK_CLOCK_H_