Adds a class that makes it easy to subclass a HWND and filter messages sent to it.

ui/views/views.gyp

 # 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.
 {
   'variables': {
     'chromium_code': 1,
   },
 
   'target_defaults': {
     'conditions': [
@@ skipping 304 matching lines @@
         'widget/child_window_message_processor.cc',
         'widget/child_window_message_processor.h',
         'widget/default_theme_provider.cc',
         'widget/default_theme_provider.h',
         'widget/desktop_native_widget_helper_aura.cc',
         'widget/desktop_native_widget_helper_aura.h',
         'widget/drop_helper.cc',
         'widget/drop_helper.h',
         'widget/drop_target_win.cc',
         'widget/drop_target_win.h',
+        'widget/hwnd_subclass.cc',
+        'widget/hwnd_subclass.h',
         'widget/root_view.cc',
         'widget/root_view.h',
         'widget/tooltip_manager_aura.cc',
         'widget/tooltip_manager_aura.h',
         'widget/tooltip_manager_win.cc',
         'widget/tooltip_manager_win.h',
         'widget/tooltip_manager.cc',
         'widget/tooltip_manager.h',
         'widget/monitor_win.cc',
         'widget/monitor_win.h',
@@ skipping 84 matching lines @@
           ],
         }],
         ['OS=="win"', {
           'dependencies': [
             # For accessibility
             '../../third_party/iaccessible2/iaccessible2.gyp:iaccessible2',
           ],
           'include_dirs': [
             '../../third_party/wtl/include',
           ],
+        }, {  # OS!="win"
+          'sources!': [
+            'widget/hwnd_subclass.cc',
+            'widget/hwnd_subclass.h',
+          ],
         }],
         ['use_x11==0', {
           'sources!': [
             'events/event_x.cc',
           ],
         }],
       ],
     }, # target_name: views
     {
       'target_name': 'views_unittests',
@@ skipping 50 matching lines @@
         'layout/box_layout_unittest.cc',
         'layout/grid_layout_unittest.cc',
         'test/test_tooltip_client.h',
         'test/test_views_delegate.cc',
         'test/test_views_delegate.h',
         'test/views_test_base.cc',
         'test/views_test_base.h',
         'view_model_unittest.cc',
         'view_model_utils_unittest.cc',
         'view_unittest.cc',
+        'widget/hwnd_subclass_unittest.cc',
         'widget/native_widget_aura_unittest.cc',
         'widget/native_widget_test_utils.h',
         'widget/native_widget_test_utils_aura.cc',
         'widget/native_widget_test_utils_win.cc',
         'widget/native_widget_unittest.cc',
         'widget/native_widget_win_unittest.cc',
         'widget/widget_unittest.cc',
         'run_all_unittests.cc',
 
         '<(SHARED_INTERMEDIATE_DIR)/ui/gfx/gfx_resources.rc',
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources.rc',
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources_standard/ui_resources_standard.rc',
       ],
       'conditions': [
         ['OS=="win"', {
           'link_settings': {
             'libraries': [
               '-limm32.lib',
               '-loleacc.lib',
             ]
           },
           'include_dirs': [
             '../third_party/wtl/include',
           ],
+        }, {  # OS!="win"
+          'sources!': [
+            'widget/hwnd_subclass_unittest.cc',
+          ],
         }],
         ['use_aura==0 and OS=="win"', {
           'sources/': [
             ['exclude', 'controls/combobox/native_combobox_views_unittest.cc'],
             ['exclude', 'controls/textfield/native_textfield_views_unittest.cc'],
             ['exclude', 'controls/tree/tree_view_views_unittest.cc'],
           ],
         }],
         [ 'use_aura==1', {
           'dependencies': [
@@ skipping 163 matching lines @@
           'sources/': [
             # This is needed because the aura rule strips it from the default
             # sources list.
             ['include', '^../../content/app/startup_helper_win.cc'],
           ],
         }],
       ],
     },  # target_name: views_examples_lib
   ],
 }