Add a couple UIKit util functions in src/ui/ios/

ui/ios/ui_ios_tests.gyp

 # Copyright 2014 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': [
     {
       'target_name': 'ui_ios_unittests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:run_all_unittests',
         '../../base/base.gyp:test_support_base',
         '../../testing/gtest.gyp:gtest',
         'ui_ios.gyp:ui_ios',
       ],
       'sources' : [
         'NSString+CrStringDrawing_unittest.mm',
+        'uikit_util_unittest.mm',
       ],
     },
   ],
 }