isolates: remove Isolate2 interface, add top-level spawn functions, more comments

tests/isolate/src/APIv2_unresolvedPortsBrowserTest.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.
 
 // spawns multiple isolates and sends unresolved ports between them.
 #library('unresolved_ports');
-#import("dart:dom"); // import added so test.dart can treat this as a webtest.
+#import('dart:dom'); // import added so test.dart can treat this as a webtest.
 #import('dart:isolate');
-#import("../../../client/testing/unittest/unittest.dart");
+#import('../../../client/testing/unittest/unittest.dart');
 
-// This is similar as SpawnFromCodeAPIv2Test but using 'unittest.dart' so it can
-// run to completion in browsers.
+// This is similar to APIv2_unresolvedPortsStandaloneTest but using
+// 'unittest.dart' so it can run to completion in browsers.
 
-bethIsolate(ReceivePort port) {
+bethIsolate() {
   port.receive((msg, reply) => msg[1].send(
-        "${msg[0]}\nBeth says: Tim are you coming? And Bob?", reply));
+        '${msg[0]}\nBeth says: Tim are you coming? And Bob?', reply));
 }
 
-timIsolate(ReceivePort port) {
-  Isolate2 bob = new Isolate2.fromCode(bobIsolate);
-  port.receive((msg, reply) => bob.sendPort.send(
-        "$msg\nTim says: Can you tell 'main' that we are all coming?", reply));
+timIsolate() {
+  SendPort bob = spawnFunction(bobIsolate);
+  port.receive((msg, reply) => bob.send(
+        '$msg\nTim says: Can you tell "main" that we are all coming?', reply));
 }
 
-bobIsolate(ReceivePort port) {
+bobIsolate() {
   port.receive((msg, reply) => reply.send(
-        "$msg\nBob says: we are all coming!"));
+        '$msg\nBob says: we are all coming!'));
 }
 
 main() {
-  asyncTest("Message chain with unresolved ports", 1, () {
+  asyncTest('Message chain with unresolved ports', 1, () {
     ReceivePort port = new ReceivePort();
     port.receive((msg, _) {
-      expect(msg).equals("main says: Beth, find out if Tim is coming."
-        + "\nBeth says: Tim are you coming? And Bob?"
-        + "\nTim says: Can you tell 'main' that we are all coming?"
-        + "\nBob says: we are all coming!");
+      expect(msg).equals('main says: Beth, find out if Tim is coming.'
+        + '\nBeth says: Tim are you coming? And Bob?'
+        + '\nTim says: Can you tell "main" that we are all coming?'
+        + '\nBob says: we are all coming!');
       port.close();
       callbackDone();
     });
 
-    Isolate2 tim = new Isolate2.fromCode(timIsolate);
-    Isolate2 beth = new Isolate2.fromCode(bethIsolate);
+    SendPort tim = spawnFunction(timIsolate);
+    SendPort beth = spawnFunction(bethIsolate);
 
-    beth.sendPort.send(
+    beth.send(
         // because tim is created asynchronously, here we are sending an
         // unresolved port:
-        ["main says: Beth, find out if Tim is coming.", tim.sendPort],
+        ['main says: Beth, find out if Tim is coming.', tim],
         port.toSendPort());
   });
 }