Updating JSON Schema Compiler to add description field to schemas.

tools/json_schema_compiler/dart_test/events.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.
 
+// This comment is for the events namespace.
 namespace events {
   dictionary EventArgumentElement {
     DOMString elementStringArg;
   };
 
   dictionary EventArgument {
     // A file entry
     [instanceOf=FileEntry] object entryArg;
 
     // A string
@@ skipping 31 matching lines @@
     // Documentation for an event with an optional primitive argument.
     static void optionalPrimitiveArgEvent(optional int argument);
 
     // Documentation for an event with a non-optional dictionary argument.
     static void nonOptionalDictArgEvent(EventArgument argument);
 
     // Documentation for an event with a optional dictionary argument.
     static void optionalDictArgEvent(EventArgument argument);
   };
 };