Add GN build file for ui/base target.

ui/base/ui_base.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': [
     {
@@ skipping 227 matching lines @@
         'touch/touch_device.cc',
         'touch/touch_device.h',
         'touch/touch_device_android.cc',
         'touch/touch_device_aurax11.cc',
         'touch/touch_device_ozone.cc',
         'touch/touch_device_win.cc',
         'touch/touch_editing_controller.cc',
         'touch/touch_editing_controller.h',
         'touch/touch_enabled.cc',
         'touch/touch_enabled.h',
+        'ui_base_export.h',
         'ui_base_exports.cc',
         'ui_base_paths.cc',
         'ui_base_paths.h',
         'ui_base_switches.cc',
         'ui_base_switches.h',
         'ui_base_switches_util.cc',
         'ui_base_switches_util.h',
         'ui_base_types.cc',
         'ui_base_types.h',
-        'ui_base_export.h',
         'view_prop.cc',
         'view_prop.h',
         'webui/jstemplate_builder.cc',
         'webui/jstemplate_builder.h',
         'webui/web_ui_util.cc',
         'webui/web_ui_util.h',
         'win/accessibility_ids_win.h',
         'win/accessibility_misc_utils.cc',
         'win/accessibility_misc_utils.h',
         'win/atl_module.h',
@@ skipping 356 matching lines @@
            'variables': {
              'jni_gen_package': 'ui',
              'jni_generator_ptr_type': 'long',
            },
            'includes': [ '../../build/jni_generator.gypi' ],
          },
        ],
     }],
   ],
 }