Updating JSON Schema Compiler to add description field to schemas.

tools/json_schema_compiler/test/browser_action.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": "browserAction",
+    "description": "The browserAction API.",
     "dependencies": [ "tabs" ],
     "types": [
       {
         "id": "ColorArray",
         "type": "array",
         "items": {
           "type": "integer",
           "minimum": 0,
           "maximum": 255
         },
@@ skipping 245 matching lines @@
         "parameters": [
           {
             "name": "tab",
             "$ref": "Tab"
           }
         ]
       }
     ]
   }
 ]