Add a Clock and TickClock interface for mocking out time

base/default_tick_clock.cc

+// 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.
+
+#include "base/default_tick_clock.h"
+#include "base/lazy_instance.h"
+
+namespace base {
+
+namespace {
+
+LazyInstance<DefaultTickClock> default_tick_clock = LAZY_INSTANCE_INITIALIZER;

[Ryan Sleevi, 2012/12/17 19:54:46]

DESIGN: Same here

[akalin, 2012/12/17 22:38:31]

also removed this

+
+}  // namespace
+
+DefaultTickClock::~DefaultTickClock() {}
+
+TimeTicks DefaultTickClock::NowTicks() {
+  return TimeTicks::Now();
+}
+
+// static
+DefaultTickClock* DefaultTickClock::Get() {
+  return default_tick_clock.Pointer();
+}
+
+}  // namespace base