Updating JSON Schema Compiler to add description field to schemas.

chrome/common/extensions/api/streams_private.json

 // Copyright (c) 2013 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":"streamsPrivate",
-    "types": [
-    ],
-
+    "description": "none",
     "events": [
       {
         "name": "onExecuteMimeTypeHandler",
         "type": "function",
         "description": "Fired when a resource is fetched which matches a mime type handled by this extension. The resource request is cancelled, and the extension is expected to handle the request. The event is restricted to a small number of white-listed extensions.",
         "parameters": [
           {
             "name": "mimeType",
             "type": "string",
             "description": "The MIME type of the intercepted URL request."
@@ skipping 20 matching lines @@
           }
         ]
       }
     ],
 
     "functions": [
     ]
   }
 ]