Add the basic code skeleton for system info event router

chrome/chrome_browser_extensions.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': 'browser_extensions',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 520 matching lines @@
         'browser/extensions/settings/weak_unlimited_settings_storage.cc',
         'browser/extensions/settings/weak_unlimited_settings_storage.h',
         'browser/extensions/shell_window_registry.cc',
         'browser/extensions/shell_window_registry.h',
         'browser/extensions/startup_helper.cc',
         'browser/extensions/startup_helper.h',
         'browser/extensions/state_store.cc',
         'browser/extensions/state_store.h',
         'browser/extensions/system/system_api.cc',
         'browser/extensions/system/system_api.h',
+        'browser/extensions/system_info_event_router.cc',
+        'browser/extensions/system_info_event_router.h',
+        'browser/extensions/system_info_watcher.cc',
+        'browser/extensions/system_info_watcher.h',
+        'browser/extensions/system_info_watcher_linux.cc',
+        'browser/extensions/system_info_watcher_mac.cc',
+        'browser/extensions/system_info_watcher_win.cc',
         'browser/extensions/tab_helper.cc',
         'browser/extensions/tab_helper.h',
         'browser/extensions/theme_installed_infobar_delegate.cc',
         'browser/extensions/theme_installed_infobar_delegate.h',
         'browser/extensions/unpacked_installer.cc',
         'browser/extensions/unpacked_installer.h',
         'browser/extensions/updater/extension_downloader.cc',
         'browser/extensions/updater/extension_downloader.h',
         'browser/extensions/updater/extension_downloader_delegate.cc',
         'browser/extensions/updater/extension_downloader_delegate.h',
@@ skipping 216 matching lines @@
           'sources': [
             'browser/extensions/app_host.rc',
             'browser/extensions/app_host_stub_main.cc',
           ],
         },
       ],
     }, ],  # 'OS=="win"'
   ],  # 'conditions'
 }