This adds a private extension API to use for simple networking

chrome/common/extensions/permissions/api_permission.h

 // 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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_PERMISSIONS_API_PERMISSION_H_
 #define CHROME_COMMON_EXTENSIONS_PERMISSIONS_API_PERMISSION_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 69 matching lines @@
     kInput,
     kInputMethodPrivate,
     kManagedModePrivate,
     kManagement,
     kMediaGalleries,
     kMediaGalleriesRead,
     kMediaGalleriesAllAutoDetected,
     kMediaGalleriesPrivate,
     kMediaPlayerPrivate,
     kMetricsPrivate,
+    kNetworkingPrivate,
     kNotification,
     kPageCapture,
     kPointerLock,
     kPlugin,
     kPrivacy,
     kProxy,
     kPushMessaging,
     kRtcPrivate,
     kSerial,
     kSocket,
@@ skipping 186 matching lines @@
   const char* const name_;
   const int flags_;
   const int l10n_message_id_;
   const PermissionMessage::ID message_id_;
   const APIPermissionConstructor api_permission_constructor_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_PERMISSIONS_API_PERMISSION_H_