Add new NSPasteboard utility function and tests.

ui/base/ui_base_tests.gyp

 # Copyright 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 17 matching lines @@
         '../strings/ui_strings.gyp:ui_strings',
         'ime/ui_base_ime.gyp:ui_base_ime',
         'ui_base.gyp:ui_base',
         'ui_base.gyp:ui_data_pack',
         'ui_base.gyp:ui_base_test_support',
       ],
       # iOS uses a small subset of ui. common_sources are the only files that
       # are built on iOS.
       'common_sources' : [
         # Note: file list duplicated in GN build.
+        'clipboard/clipboard_util_mac_unittest.mm',
         'ios/cru_context_menu_controller_unittest.mm',
         'l10n/l10n_util_mac_unittest.mm',
         'l10n/l10n_util_unittest.cc',
         'l10n/l10n_util_win_unittest.cc',
         'l10n/time_format_unittest.cc',
         'layout_unittest.cc',
         'models/tree_node_iterator_unittest.cc',
         'resource/data_pack_literal.cc',
         'resource/data_pack_unittest.cc',
         'resource/resource_bundle_mac_unittest.mm',
@@ skipping 276 matching lines @@
               'dependencies': [
                 '../../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }