Implement <appview>

chrome/common/extensions/api/guest_view_internal.json

 // Copyright 2014 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.
 
 [
   {
     "namespace": "guestViewInternal",
     "compiler_options": {
       "implemented_in": "chrome/browser/extensions/api/guest_view/guest_view_internal_api.h"
     },
     "description": "none",
     "functions": [
       {
         "name": "createGuest",
         "type": "function",
         "parameters": [
           {
             "type": "string",
             "name": "viewType",
             "nodoc": true
           },
           {
             "type": "object",
             "name": "createParams",
-            "properties": {
-              "storagePartitionId": {
-                "type": "string",
-                "optional": true
-              }
-            }
+            "additionalProperties": {"type": "any"}
           },
           {
             "type": "function",
             "name": "callback",
             "parameters": [
               {
                 "type": "integer",
                 "name": "instanceId"
               }
             ]
           }
         ]
       }
     ]
   }
 ]