Updating JSON Schema Compiler to add description field to schemas.

chrome/common/extensions/api/system_private.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.
 
 [
   {
     "namespace": "systemPrivate",
-    "nodoc": true,
+    "description": "none",
     "types": [
       {
         "id": "UpdateStatus",
         "type": "object",
         "description": "Information about the system update.",
         "properties": {
           "state": {
             "type": "string",
             "enum": ["NotAvailable", "Updating", "NeedRestart"],
             "description": "State of system update.  NotAvailable when there is no available update or the update system is in error state, Updating when a system update is in progress, NeedRestart when a system update is finished and restart is needed."
@@ skipping 102 matching lines @@
       },
       {
         "name": "onWokeUp",
         "type": "function",
         "description": "Fired when the device wakes up from sleep.",
         "parameters": []
       }
     ]
   }
 ]