Add dart:io stubs to ddc sdk, define dart.library.html

pkg/dev_compiler/test/browser/language_tests.js

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 define(['dart_sdk', 'async_helper', 'expect', 'unittest', 'is', 'require'],
       function(dart_sdk, async_helper, expect, unittest, is, require) {
   'use strict';
 
   async_helper = async_helper.async_helper;
   let minitest = expect.minitest;
@@ skipping 605 matching lines @@
       'invoke_private_test': fail,
       'invoke_private_wrong_library_test': fail,
       'invoke_test': fail,
       'invoke_throws_test': fail,
       'io_html_mutual_exclusion_test': fail,
       'libraries_test': fail,
       'library_enumeration_deferred_loading_test': fail,
       'library_imports_bad_metadata_test_none_multi': fail,
       'library_metadata2_test_none_multi': fail,
       'library_metadata_test': fail,
+      'library_uri_io_test': fail,
       'library_uri_package_test': fail,
       'list_constructor_test_01_multi': fail,
       'list_constructor_test_none_multi': fail,
       'local_function_is_static_test': fail,
       'local_isolate_test': fail,
       'metadata_allowed_values_test_none_multi': fail,
       'metadata_scope_test_none_multi': fail,
       'metadata_test': fail,
       'method_mirror_location_test': fail,
       'method_mirror_returntype_test': fail,
@@ skipping 207 matching lines @@
 
     for (let action of unittest_tests) {
       try {
         action();
       } catch (e) {
         console.error("Caught error tying to setup test:", e);
       }
     }
   });
 });