Add a Clock and TickClock interface for mocking out time

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 816 matching lines @@
         'test/null_task_runner.cc',
         'test/null_task_runner.h',
         'test/perf_test_suite.cc',
         'test/perf_test_suite.h',
         'test/scoped_locale.cc',
         'test/scoped_locale.h',
         'test/scoped_path_override.cc',
         'test/scoped_path_override.h',
         'test/sequenced_task_runner_test_template.cc',
         'test/sequenced_task_runner_test_template.h',
+        'test/simple_test_clock.cc',
+        'test/simple_test_clock.h',
+        'test/simple_test_tick_clock.cc',
+        'test/simple_test_tick_clock.h',
         'test/task_runner_test_template.cc',
         'test/task_runner_test_template.h',
         'test/test_file_util.h',
         'test/test_file_util_linux.cc',
         'test/test_file_util_mac.cc',
         'test/test_file_util_posix.cc',
         'test/test_file_util_win.cc',
         'test/test_listener_ios.h',
         'test/test_listener_ios.mm',
         'test/test_pending_task.cc',
@@ skipping 335 matching lines @@
             'base_unittests.isolate',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }