Updating JSON Schema Compiler to add description field to schemas.

tools/json_schema_compiler/dart_test/operatable_type.idl

Index: tools/json_schema_compiler/dart_test/operatable_type.idl
diff --git a/tools/json_schema_compiler/dart_test/operatable_type.idl b/tools/json_schema_compiler/dart_test/operatable_type.idl
index 74ce534544630d5daea9f6412959289b726c0952..9c5f53cc0ef0c16a8394c9a3396344c154a78199 100644
--- a/tools/json_schema_compiler/dart_test/operatable_type.idl
+++ b/tools/json_schema_compiler/dart_test/operatable_type.idl
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Top-level namespace-comment for operatableType
 namespace operatable_type {
   dictionary DictType {
     int x;
@@ -28,4 +29,4 @@ namespace operatable_type {
     // Function taking dict type.
     static void dictArgFunc(DictType d);
   };
-};
+};