Add synthetic delay testing framework

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,
       'base_i18n_target': 0,
     },
@@ skipping 142 matching lines @@
           'debug/stack_trace.h',
           'debug/stack_trace_android.cc',
           'debug/stack_trace_ios.mm',
           'debug/stack_trace_posix.cc',
           'debug/stack_trace_win.cc',
           'debug/trace_event.h',
           'debug/trace_event_android.cc',
           'debug/trace_event_impl.cc',
           'debug/trace_event_impl.h',
           'debug/trace_event_impl_constants.cc',
+          'debug/trace_event_synthetic_delay.cc',
+          'debug/trace_event_synthetic_delay.h',
           'debug/trace_event_system_stats_monitor.cc',
           'debug/trace_event_memory.cc',
           'debug/trace_event_memory.h',
           'debug/trace_event_win.cc',
           'deferred_sequenced_task_runner.cc',
           'deferred_sequenced_task_runner.h',
           'environment.cc',
           'environment.h',
           'file_descriptor_posix.h',
           'file_util.cc',
@@ skipping 810 matching lines @@
           'i18n/string_search.h',
           'i18n/time_formatting.cc',
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
         ],
       }]
     ],
   },
 }