Big merge from experimental to bleeding edge.

tests/standalone/io/test_extension_test.dart

 // Copyright (c) 2012, 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.
 //
 // Dart test program for testing native extensions.
 
-import "dart:io";
+import 'dart:async';
+import 'dart:io';
+import 'dart:isolate';
 
 Future copyFileToDirectory(Path file, Path directory) {
   String src = file.toNativePath();
   String dst = directory.toNativePath();
   switch (Platform.operatingSystem) {
     case 'linux':
     case 'macos':
       return Process.run('cp', [src, dst]);
     case 'windows':
       return Process.run('cmd.exe', ['/C', 'copy $src $dst']);
@@ skipping 19 matching lines @@
   Options options = new Options();
 
   Path scriptDirectory = new Path.fromNative(options.script).directoryPath;
   Path buildDirectory = new Path.fromNative(options.executable).directoryPath;
   Directory tempDirectory = new Directory('').createTempSync();
   Path testDirectory = new Path.fromNative(tempDirectory.path);
 
   // Copy test_extension shared library, test_extension.dart and
   // test_extension_tester.dart to the temporary test directory.
   copyFileToDirectory(getExtensionPath(buildDirectory),
-                      testDirectory).chain((_) {
+                      testDirectory).then((_) {
     Path extensionDartFile = scriptDirectory.append('test_extension.dart');
     return copyFileToDirectory(extensionDartFile, testDirectory);
-  }).chain((_) {
+  }).then((_) {
     Path testExtensionTesterFile =
         scriptDirectory.append('test_extension_tester.dart');
     return copyFileToDirectory(testExtensionTesterFile, testDirectory);
-  }).chain((_) {
+  }).then((_) {
     Path script = testDirectory.append('test_extension_tester.dart');
     return Process.run(options.executable, [script.toNativePath()]);
   })..then((ProcessResult result) {
     Expect.equals(0, result.exitCode);
     tempDirectory.deleteSync(recursive: true);
-  })..handleException((_) {
+  })..catchError((_) {
     tempDirectory.deleteSync(recursive: true);
   });
 }