Updating JSON Schema Compiler to add description field to schemas.

chrome/common/extensions/api/experimental_input_virtual_keyboard.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": "experimental.input.virtualKeyboard",
-    "nodoc": true,
-    "types": [],
+    "description": "none",
     "functions": [
       {
         "name": "insertText",
         "type": "function",
         "description": "Inserts text into the currently focused text field.",
         "parameters": [
           { "name": "text",
             "type": "string",
             "description": "The text that will be inserted."
           },
           { "type": "function",
             "name": "callback",
             "optional": true,
             "description": "Called when the insertion is completed.",
             "parameters": []
           }
         ]
       }
     ]
   }
 ]