Updating JSON Schema Compiler to add description field to schemas.

chrome/common/extensions/api/devtools/experimental_audits.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.devtools.audits",
+    "description": "Use the <code>chrome.experimental.devtools.audits</code> API to add new audit categories to the Developer Tools' Audit panel.",
     "nocompile": true,
     "functions": [
       {
         "name": "addCategory",
         "type": "function",
         "description": "Adds an audit category.",
         "parameters": [
           { "name": "displayName", "type": "string", "description": "A display name for the category." },
           { "name": "resultCount", "type": "number", "description": "The expected number of audit results in the category." }
         ],
@@ skipping 163 matching lines @@
             "type": "string"
           },
           "Severe": {
             "type": "string"
           }
         }
       }
     ]
   }
 ]