Expand usage of platform-apps flag and permission features.

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.
 
 {
   "appNotifications": {
     "extension_types": ["packaged_app", "hosted_app"]
   },
   "background": {
     "extension_types": [
@@ skipping 41 matching lines @@
   },
   "cookies": {
     "extension_types": ["extension", "packaged_app"]
   },
   "debugger": {
     "extension_types": ["extension", "packaged_app", "platform_app"]
   },
   "devtools": {
     "extension_types": ["extension", "packaged_app", "platform_app"]
   },
+  "dns": {
+    "extension_types": ["platform_app"]
+  },
   "experimental": {
     "extension_types": [
       "extension", "packaged_app", "hosted_app", "platform_app"
     ]
   },
   "fileBrowserHandler": {
     "extension_types": ["extension", "packaged_app", "platform_app"]
   },
   "fileBrowserPrivate": {
     "extension_types": ["extension", "packaged_app", "platform_app"],
@@ skipping 55 matching lines @@
   },
   "plugin": {
     "extension_types": ["extension", "packaged_app", "platform_app"]
   },
   "privacy": {
     "extension_types": ["extension", "packaged_app", "platform_app"]
   },
   "proxy": {
     "extension_types": ["extension", "packaged_app", "platform_app"]
   },
+  "serial": {
+    "extension_types": ["platform_app"]
+  },
   "socket": {
     "extension_types": ["platform_app"]
   },
   "storage": {
     "extension_types": ["extension", "packaged_app", "platform_app"]
   },
   "systemPrivate": {
     "extension_types": ["extension", "packaged_app", "platform_app"],
     "location": "component"
   },
@@ skipping 38 matching lines @@
       "afchcafgojfnemjkcbhfekplkmjaldaa"   // Enterprise Web Store
     ]
   },
   "webRequest": {
     "extension_types": ["extension", "packaged_app"]
   },
   "webRequestBlocking": {
     "extension_types": ["extension", "packaged_app"]
   }
 }