Give platform apps control over launcher right-click context menu.

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 306 matching lines @@
         'browser/extensions/browser_action_test_util_gtk.cc',
         'browser/extensions/browser_action_test_util_mac.mm',
         'browser/extensions/browser_event_router.cc',
         'browser/extensions/browser_event_router.h',
         'browser/extensions/browser_extension_window_controller.cc',
         'browser/extensions/browser_extension_window_controller.h',
         'browser/extensions/bundle_installer.cc',
         'browser/extensions/bundle_installer.h',
         'browser/extensions/component_loader.cc',
         'browser/extensions/component_loader.h',
+        'browser/extensions/context_menu_manager.cc',
+        'browser/extensions/context_menu_manager.h',
         'browser/extensions/convert_user_script.cc',
         'browser/extensions/convert_user_script.h',
         'browser/extensions/convert_web_app.cc',
         'browser/extensions/convert_web_app.h',
         'browser/extensions/crx_file.cc',
         'browser/extensions/crx_file.h',
         'browser/extensions/crx_installer.cc',
         'browser/extensions/crx_installer.h',
         'browser/extensions/crx_installer_error.h',
         'browser/extensions/data_deleter.cc',
@@ skipping 456 matching lines @@
             'browser/extensions/app_host/binaries_installer.h',
             'browser/extensions/app_host/binaries_installer_internal.cc',
             'browser/extensions/app_host/binaries_installer_internal.h',
           ],
         },
       ],
     }, ],  # 'OS=="win"'
   ],  # 'conditions'
 }