Updating JSON Schema Compiler to add description field to schemas.

chrome/common/extensions/api/rtc_private.idl

 // 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.
 
+// rtcPrivate.
 namespace rtcPrivate {
   // Launch action type.
   enum ActionType {chat, voice, video};
 
   dictionary LaunchIntent {
     // Launch action.
     ActionType action;
 
     // Launch data payload.
     object data;
 
     // MIME type.
     DOMString type;
   };
 
   dictionary LaunchData {
     // Launch intent.
     LaunchIntent intent;
   };
 
   interface Events {
     // Fired when an RTC launch event is raised.
     static void onLaunch(optional LaunchData data);
   };
 };