Add FakeClipboard implementation for unit tests.

ui/base/ui_base_tests.gypi

 # 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.
 
 {
   'type': '<(gtest_target_type)',
   'dependencies': [
     '../../base/base.gyp:base',
     '../../base/base.gyp:test_support_base',
     '../../net/net.gyp:net',
@@ skipping 50 matching lines @@
     'ime/chromeos/character_composer_unittest.cc',
     'ime/composition_text_util_pango_unittest.cc',
     'ime/input_method_base_unittest.cc',
     'ime/input_method_chromeos_unittest.cc',
     'ime/remote_input_method_win_unittest.cc',
     'ime/win/imm32_manager_unittest.cc',
     'ime/win/tsf_input_scope_unittest.cc',
     'models/list_model_unittest.cc',
     'models/list_selection_model_unittest.cc',
     'models/tree_node_model_unittest.cc',
+    'test/test_clipboard_unittest.cc',
     'test/data/resource.h',
     'text/bytes_formatting_unittest.cc',
     'view_prop_unittest.cc',
     'webui/web_ui_util_unittest.cc',
     'x/selection_requestor_unittest.cc',
   ],
   'include_dirs': [
     '../..',
   ],
   'conditions': [
@@ skipping 143 matching lines @@
   'target_conditions': [
     ['OS == "ios"', {
       'sources/': [
         # Pull in specific Mac files for iOS (which have been filtered out
         # by file name rules).
         ['include', '^l10n/l10n_util_mac_unittest\\.mm$'],
       ],
     }],
   ],
 }