Add a specialized apps::NativeAppWindow for app_shell

apps/apps.gypi

 # Copyright 2013 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': 'apps',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 111 matching lines @@
           ],
           'include_dirs': [
             '..',
           ],
           'sources': [
             'shell/app/shell_main_delegate.cc',
             'shell/app/shell_main_delegate.h',
             'shell/app/shell_main.cc',
             'shell/browser/shell_app_sorting.cc',
             'shell/browser/shell_app_sorting.h',
+            'shell/browser/shell_apps_client.cc',
+            'shell/browser/shell_apps_client.h',
             'shell/browser/shell_browser_context.cc',
             'shell/browser/shell_browser_context.h',
             'shell/browser/shell_browser_main_parts.cc',
             'shell/browser/shell_browser_main_parts.h',
             'shell/browser/shell_content_browser_client.cc',
             'shell/browser/shell_content_browser_client.h',
             'shell/browser/shell_extension_system.cc',
             'shell/browser/shell_extension_system.h',
             'shell/browser/shell_extensions_browser_client.cc',
             'shell/browser/shell_extensions_browser_client.h',
+            'shell/browser/shell_native_app_window.cc',
+            'shell/browser/shell_native_app_window.h',
+            'shell/browser/shell_shell_window_delegate.cc',
+            'shell/browser/shell_shell_window_delegate.h',
             'shell/browser/web_view_window.cc',
             'shell/browser/web_view_window.cc',
             'shell/common/shell_content_client.cc',
             'shell/common/shell_content_client.h',
             'shell/common/shell_extensions_client.cc',
             'shell/common/shell_extensions_client.h',
             'shell/renderer/shell_content_renderer_client.cc',
             'shell/renderer/shell_content_renderer_client.h',
           ],
           'conditions': [
             ['OS=="win"', {
               'msvs_settings': {
                 'VCLinkerTool': {
                   'SubSystem': '2',  # Set /SUBSYSTEM:WINDOWS
                 },
               },
               'dependencies': [
                 '../sandbox/sandbox.gyp:sandbox',
               ],
             }],
           ],
         },
       ],  # targets
     }],  # chromeos==1
   ],  # conditions
 }