Introduce ui.dll / libui.so for the component build.

ui/ui_base.gypi

 # Copyright (c) 2011 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_base',
-      'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
+        '../base/base.gyp:base_static',
         '../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../build/temp_gyp/googleurl.gyp:googleurl',
         '../net/net.gyp:net',
         '../skia/skia.gyp:skia',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         'base/strings/ui_strings.gyp:ui_strings',
         'ui_gfx',
       ],
       # Export these dependencies since text_elider.h includes ICU headers.
@@ skipping 125 matching lines @@
         'base/ui_base_paths.cc',
         'base/ui_base_paths.h',
         'base/ui_base_switches.cc',
         'base/ui_base_switches.h',
         'base/view_prop.cc',
         'base/view_prop.h',
         'base/win/hwnd_util.cc',
         'base/win/hwnd_util.h',
         'base/win/ime_input.cc',
         'base/win/ime_input.h',
-        'base/win/shell.cc',
-        'base/win/shell.h',
+        'base/win/shell.cc',
+        'base/win/shell.h',
         'base/win/window_impl.cc',
         'base/win/window_impl.h',
         'base/x/active_window_watcher_x.cc',
         'base/x/active_window_watcher_x.h',
         'base/x/x11_util.cc',
         'base/x/x11_util.h',
         'base/x/x11_util_internal.h',
       ],
       'conditions': [
         ['toolkit_uses_gtk == 1', {
@@ skipping 21 matching lines @@
               ],
             }, {
               # Note: because of gyp predence rules this has to be defined as
               # 'sources/' rather than 'sources!'.
               'sources/': [
                 ['include', '^base/dragdrop/os_exchange_data.cc'],
               ],
             }],
           ],
         }],
-        ['OS!="win"', {
+        ['OS=="win"', {
+          'type': '<(component)', 
+        },{  # else: OS!="win"
+          'type': 'static_library',
           'sources!': [
             'base/dragdrop/drag_source.cc',
             'base/dragdrop/drag_source.h',
             'base/dragdrop/drag_drop_types.h',
             'base/dragdrop/drop_target.cc',
             'base/dragdrop/drop_target.h',
             'base/dragdrop/os_exchange_data.cc',
             'base/view_prop.cc',
             'base/view_prop.h',
           ],
           'sources/': [
             ['exclude', '^base/win/*'],
           ],
         }],
+        ['OS=="win" and component == "shared_library"', {
+          'defines': [
+            'UI_BASE_DLL',
+            'UI_BASE_IMPLEMENTATION',
+          ],
+          'msvs_disabled_warnings': [
+            4251,
+          ],
+          'direct_dependent_settings': {
+            'defines': [
+              'UI_BASE_DLL',
+            ],
+            'msvs_disabled_warnings': [
+              4251,
+            ],
+          },
+        }],
         ['OS=="mac"', {
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/Accelerate.framework',
               '$(SDKROOT)/System/Library/Frameworks/AudioUnit.framework',
             ],
           },
         }],
         ['use_x11==1', {
           'all_dependent_settings': {
@@ skipping 44 matching lines @@
       ],
     }],
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: