Updating JSON Schema Compiler to add description field to schemas.

tools/json_schema_compiler/dart_test/functions.idl

 // Copyright 2013 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.
 
+// A comment for the functions namespace.
 namespace functions {
   callback SimpleCallback = void ();
 
   callback PrimitiveCallback = void (int i);
 
   callback DictCallback = void ([instanceOf=DictType] object dict);
 
   dictionary DictType {
     // A field.
     int a;
@@ skipping 30 matching lines @@
     // Function taking a primitive callback.
     static void primitiveCallbackFunc(PrimitiveCallback c);
 
     // Function taking a dictionary callback.
     static void dictCallbackFunc(DictCallback c);
 
     // Function returning a dictionary.
     static DictType dictRetFunc();
   };
 };