Adds USB writing for OS X.

chrome/chrome_common.gypi

 # Copyright (c) 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'common',
       'type': 'static_library',
       'variables': {
@@ skipping 156 matching lines @@
         'common/extensions/extension_file_util.cc',
         'common/extensions/extension_file_util.h',
         'common/extensions/extension_process_policy.cc',
         'common/extensions/extension_process_policy.h',
         'common/extensions/features/chrome_channel_feature_filter.cc',
         'common/extensions/features/chrome_channel_feature_filter.h',
         'common/extensions/features/feature_channel.cc',
         'common/extensions/features/feature_channel.h',
         'common/extensions/file_handler_info.cc',
         'common/extensions/file_handler_info.h',
+        'common/extensions/image_writer_util_mac.cc',
+        'common/extensions/image_writer_util_mac.h',
         'common/extensions/manifest_handlers/app_isolation_info.cc',
         'common/extensions/manifest_handlers/app_isolation_info.h',
         'common/extensions/manifest_handlers/app_launch_info.cc',
         'common/extensions/manifest_handlers/app_launch_info.h',
         'common/extensions/manifest_handlers/automation.h',
         'common/extensions/manifest_handlers/automation.cc',
         'common/extensions/manifest_handlers/content_scripts_handler.cc',
         'common/extensions/manifest_handlers/content_scripts_handler.h',
         'common/extensions/manifest_handlers/mime_types_handler.cc',
         'common/extensions/manifest_handlers/mime_types_handler.h',
@@ skipping 500 matching lines @@
         'common/metrics/proto/permuted_entropy_cache.proto',
       ],
       'variables': {
         'proto_in_dir': 'common/metrics/proto',
         'proto_out_dir': 'chrome/common/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }