Updating JSON Schema Compiler to add description field to schemas.

chrome/common/extensions/api/experimental_system_info_storage.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.
 
+// Use the <code>chrome.experimental.systemInfo.storage</code> API to query
+// storage device information and be notified when it changes.
 namespace experimental.systemInfo.storage {
 
   enum StorageUnitType {
     // The storage has fixed media, e.g. hard disk or SSD.
     fixed,
     // The storage is removable, e.g. USB flash drive.
     removable,
     // The storage type is unknown.
     unknown
   };
@@ skipping 51 matching lines @@
     // Fired when the storage device available capacity is changed.
     // |info|: The changed information for the specified storage unit.
     static void onAvailableCapacityChanged(StorageChangeInfo info);
 
     // Fired when a new removable storage is attached to the system.
     static void onAttached(StorageUnitInfo info);
 
     // Fired when a removable storage is detached from the system.
     static void onDetached(DOMString id);
   };
- 
+
 };