This adds a private extension API to use for simple networking

chrome/common/extensions/api/_permission_features.json

 // 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.
 
 {
   "activeTab": {
     "channel": "dev",
     "extension_types": ["extension", "packaged_app"],
     "min_manifest_version": 2
   },
@@ skipping 234 matching lines @@
     "whitelist": [
       // The file manager is a component extension, and it can currently use
       // whitelisted interfaces without being on the corresponding whitelist.
       // Adding it to this whitelist documents its dependency, however, and also
       // doesn't hurt anything.
       "hhaomjibdihmijegdhdafkllkbggdgoj",  // File manager
       "gbkeegbaiigmenfmjfclcdgdpimamgkj",  // Quickoffice
       "ionpfmkccalenbmnddpbmocokhaknphg"   // Quickoffice dev
     ]
   },
+  "networkingPrivate": {
+    "channel": "dev",
+    "extension_types": ["extension", "packaged_app"],
+    "location": "component"
+  },
   "notifications": {
     "channel": "stable",
     "extension_types": [
       "extension", "packaged_app", "hosted_app", "platform_app"
     ]
   },
   "echoPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"],
     "location": "component"
@@ skipping 157 matching lines @@
   },
   "webRequestBlocking": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
   },
   "webview": {
     "channel": "stable",
     "extension_types": ["platform_app"]
   }
 }