Add a Clock and TickClock interface for mocking out time

base/base.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 473 matching lines @@
           'threading/thread_local_win.cc',
           'threading/thread_restrictions.h',
           'threading/thread_restrictions.cc',
           'threading/watchdog.cc',
           'threading/watchdog.h',
           'threading/worker_pool.h',
           'threading/worker_pool.cc',
           'threading/worker_pool_posix.cc',
           'threading/worker_pool_posix.h',
           'threading/worker_pool_win.cc',
+          'time/clock.cc',
+          'time/clock.h',
+          'time/default_clock.cc',
+          'time/default_clock.h',
+          'time/default_tick_clock.cc',
+          'time/default_tick_clock.h',
+          'time/tick_clock.cc',
+          'time/tick_clock.h',
+          # TODO(akalin): Move time* into time/.
           'time.cc',
           'time.h',
           'time_mac.cc',
           'time_posix.cc',
           'time_win.cc',
           'timer.cc',
           'timer.h',
           'tracked_objects.cc',
           'tracked_objects.h',
           'tracking_info.cc',
@@ skipping 246 matching lines @@
           ['<(use_system_nspr)==1 and >(nacl_untrusted_build)==0', {
             'sources/': [
               ['exclude', '^third_party/nspr/'],
             ],
           }],
         ],
       }],
     ],
   },
 }