Updating JSON Schema Compiler to add description field to schemas.

tools/json_schema_compiler/dart_test/dictionaries.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.
 
+// This comment is for the dictionaries namespace.
 namespace dictionaries {
   // Documentation for ComplexType.
   dictionary InnerType {
     // Documentation for the String s.
     DOMString s;
 
     // Documentation for the boolean b.
     int b;
 
     // Documentation for the int i.
@@ skipping 36 matching lines @@
   };
 
   dictionary ComplexType {
     // Documentation for the int i.
     int i;
 
     // Documentation for the ComplexType c.
     ComplexType c;
   };
 };