Add ScopedObjCClassSwizzler in base/mac, absorbs objc_method_swizzle and ScopedClassSwizzler

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 871 matching lines @@
         'test/null_task_runner.cc',
         'test/null_task_runner.h',
         'test/perf_log.cc',
         'test/perf_log.h',
         'test/perf_test_suite.cc',
         'test/perf_test_suite.h',
         'test/perf_time_logger.cc',
         'test/perf_time_logger.h',
         'test/power_monitor_test_base.cc',
         'test/power_monitor_test_base.h',
+        'test/scoped_class_swizzler_mac.h',
+        'test/scoped_class_swizzler_mac.mm',
         '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/sequenced_worker_pool_owner.cc',
         'test/sequenced_worker_pool_owner.h',
         'test/simple_test_clock.cc',
         'test/simple_test_clock.h',
@@ skipping 599 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }