Support use of third party time function to profiler

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 220 matching lines @@
           'process_util.h',
           'process_util_freebsd.cc',
           'process_util_linux.cc',
           'process_util_mac.mm',
           'process_util_openbsd.cc',
           'process_util_posix.cc',
           'process_util_win.cc',
           'process_win.cc',
           'profiler/scoped_profile.cc',
           'profiler/scoped_profile.h',
+          'profiler/alternate_timer.cc',
+          'profiler/alternate_timer.h',
           'profiler/tracked_time.cc',
           'profiler/tracked_time.h',
           'property_bag.cc',
           'property_bag.h',
           'rand_util.cc',
           'rand_util.h',
           'rand_util_c.h',
           'rand_util_posix.cc',
           'rand_util_win.cc',
           'safe_strerror_posix.cc',
@@ skipping 645 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }