Add support for safe math operations in base/numerics

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 478 matching lines @@
           'profiler/tracked_time.h',
           'rand_util.cc',
           'rand_util.h',
           'rand_util_nacl.cc',
           'rand_util_posix.cc',
           'rand_util_win.cc',
           'run_loop.cc',
           'run_loop.h',
           'numerics/safe_conversions.h',
           'numerics/safe_conversions_impl.h',
+          'numerics/safe_math.h',
+          'numerics/safe_math_impl.h',
           'safe_strerror_posix.cc',
           'safe_strerror_posix.h',
           'scoped_native_library.cc',
           'scoped_native_library.h',
           'sequence_checker.h',
           'sequence_checker_impl.cc',
           'sequence_checker_impl.h',
           'sequenced_task_runner.cc',
           'sequenced_task_runner.h',
           'sequenced_task_runner_helpers.h',
@@ skipping 473 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }