Rationalize Dart mojo and sky package structure

mojo/dart/testing/lib/validation_test_input_parser.dart

 // Copyright 2015 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.
 
 library validation_input_parser;
 
 import 'dart:typed_data';
 
 class ValidationParseResult {
   final Iterable<_Entry> _entries;
@@ skipping 417 matching lines @@
       try {
         var result = parse(input);
         assert(false);
       } on ValidationParseError catch(e) {
         // Pass.
       }
     }
   }
 }