Add gfx::ToRoundedInt safe conversion method from float to int.

ui/ui_unittests.gypi

 # Copyright (c) 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': [
     {
       'target_name': 'ui_test_support',
       'type': 'static_library',
       'dependencies': [
@@ skipping 63 matching lines @@
         'gfx/display_unittest.cc',
         'gfx/font_unittest.cc',
         'gfx/image/image_skia_unittest.cc',
         'gfx/image/image_unittest.cc',
         'gfx/image/image_unittest_util.cc',
         'gfx/image/image_unittest_util.h',
         'gfx/image/image_unittest_util_ios.mm',
         'gfx/image/image_unittest_util_mac.mm',
         'gfx/insets_unittest.cc',
         'gfx/rect_unittest.cc',
+        'gfx/safe_integer_conversions_unittest.cc',
         'gfx/screen_unittest.cc',
         'gfx/shadow_value_unittest.cc',
         'gfx/skbitmap_operations_unittest.cc',
         'gfx/skia_util_unittest.cc',
       ],
       'all_sources': [
         '<@(_common_sources)',
         'base/accelerators/accelerator_manager_unittest.cc',
         'base/clipboard/clipboard_unittest.cc',
         'base/clipboard/custom_data_helper_unittest.cc',
@@ skipping 179 matching lines @@
           'variables': {
             'test_suite_name': 'ui_unittests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)ui_unittests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }