Dynamically generate a heading for Extension Docs API pages

chrome/common/extensions/api/content_settings.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": "contentSettings",
+    "description": "The content settings module allows you to change settings that control whether websites can use features such as cookies, JavaScript, and plug-ins. More generally speaking, content settings allow you to customize Chrome's behavior on a per-site basis instead of globally.",
+    "compiler_options": {
+      "generate_type_functions": true
+    },
     "types": [
       {
         "id": "ResourceIdentifier",
         "type": "object",
         "properties": {
           "id": {
             "type": "string",
             "description": "The resource identifier for the given content type."
           },
           "description": {
@@ skipping 195 matching lines @@
         "$ref": "ContentSetting",
         "description": "Whether to allow sites to show desktop notifications. One of<br><var>allow</var>: Allow sites to show desktop notifications,<br><var>block</var>: Don't allow sites to show desktop notifications,<br><var>ask</var>: Ask when a site wants to show desktop notifications. <br>Default is <var>ask</var>.<br>The primary URL is the main-frame URL. The secondary URL is not used.",
         "value": [
           "notifications",
           {"type":"string", "enum": ["allow", "block", "ask"]}
         ]
       }
     }
   }
 ]