Adds USB writing for OS X.

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 188 matching lines @@
         'browser/ui/fullscreen/fullscreen_controller_test.h',
         'browser/ui/passwords/manage_passwords_ui_controller_mock.cc',
         'browser/ui/passwords/manage_passwords_ui_controller_mock.h',
         'browser/ui/test/test_confirm_bubble_model.cc',
         'browser/ui/test/test_confirm_bubble_model.h',
         'browser/ui/views/find_bar_host_unittest_util_views.cc',
         'browser/ui/website_settings/mock_permission_bubble_request.cc',
         'browser/ui/website_settings/mock_permission_bubble_request.h',
         'common/extensions/extension_test_util.cc',
         'common/extensions/extension_test_util.h',
+        'common/extensions/image_writer_test_util_mac.cc',
+        'common/extensions/image_writer_test_util_mac.h',
         'renderer/chrome_mock_render_thread.cc',
         'renderer/chrome_mock_render_thread.h',
         'renderer/media/mock_webrtc_logging_message_filter.cc',
         'renderer/media/mock_webrtc_logging_message_filter.h',
         'renderer/mock_printer.cc',
         'renderer/mock_printer.h',
         'renderer/safe_browsing/mock_feature_extractor_clock.cc',
         'renderer/safe_browsing/mock_feature_extractor_clock.h',
         'renderer/safe_browsing/test_utils.cc',
         'renderer/safe_browsing/test_utils.h',
@@ skipping 1586 matching lines @@
         'common/extensions/api/file_browser_handlers/file_browser_handler_manifest_unittest.cc',
         'common/extensions/api/file_handlers/file_handlers_manifest_unittest.cc',
         'common/extensions/api/i18n/default_locale_manifest_unittest.cc',
         'common/extensions/api/identity/extension_manifests_auth_unittest.cc',
         'common/extensions/api/storage/storage_schema_manifest_handler_unittest.cc',
         'common/extensions/command_unittest.cc',
         'common/extensions/extension_file_util_unittest.cc',
         'common/extensions/extension_icon_set_unittest.cc',
         'common/extensions/extension_unittest.cc',
         'common/extensions/feature_switch_unittest.cc',
+        'common/extensions/image_writer_util_mac_unittest.cc',
         'common/extensions/manifest_handlers/automation_unittest.cc',
         'common/extensions/manifest_handlers/content_scripts_manifest_unittest.cc',
         'common/extensions/manifest_handlers/exclude_matches_manifest_unittest.cc',
         'common/extensions/manifest_handlers/settings_overrides_handler_unittest.cc',
         'common/extensions/manifest_handlers/ui_overrides_handler_unittest.cc',
         'common/extensions/manifest_tests/extension_manifest_test.cc',
         'common/extensions/manifest_tests/extension_manifests_background_unittest.cc',
         'common/extensions/manifest_tests/extension_manifests_chromepermission_unittest.cc',
         'common/extensions/manifest_tests/extension_manifests_contentsecuritypolicy_unittest.cc',
         'common/extensions/manifest_tests/extension_manifests_default_extent_path_unittest.cc',
@@ skipping 1020 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }