Updating JSON Schema Compiler to add description field to schemas.

tools/json_schema_compiler/dart_test/tags.idl

Index: tools/json_schema_compiler/dart_test/tags.idl
diff --git a/tools/json_schema_compiler/dart_test/tags.idl b/tools/json_schema_compiler/dart_test/tags.idl
index f4ddff49be3b8d6ec708429b0d6d0baaa71ccedc..7a029cd70e37c902d215f7de815bedfa9ae594e0 100644
--- a/tools/json_schema_compiler/dart_test/tags.idl
+++ b/tools/json_schema_compiler/dart_test/tags.idl
@@ -2,30 +2,31 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// A comment describing tags.
 namespace tags {
   // This dictionary has the property [inline_doc].
   [inline_doc] dictionary InlineDoc {
   };
-  
+
   // This dictionary has the property [nodoc].
   [nodoc] dictionary Nodoc {
   };
-  
+
   // This dictionary has the property [nocompile].
   [nocompile] dictionary Nocompile {
   };
-  
+
   // This dictionary has no tags on the dictionary itself.
   dictionary PlainDict {
     // This int has the property [inline_doc].
     [inline_doc] int inline_doc;
-    
+
     // This String has the property [nodoc].
     [nodoc] String nodoc;
-    
+
     // This double has the property [nocompile].
     [nocompile] double nocompile;
-    
+
     // This object has the property [instanceOf=fileEntry].
     [instanceOf=fileEntry] object instance_of_tag;
   };