Big merge from experimental to bleeding edge.

tests/html/isolates_test.dart

 library IsolatesTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
 import 'dart:json';
 import 'dart:isolate' as isolate;
 
 String responseFor(message) => 'response for $message';
 
 void isolateEntry() {
   bool wasThrown = false;
   try {
     window.alert('Test');
   } catch (e) {
     wasThrown = true;
   }
   // If wasn't thrown, do not listen to messages to make test fail.
   if (!wasThrown) {
     return;
   }
 
   // Check that JSON library was loaded to isolate.
-  JSON.stringify([1, 2, 3]);
+  stringify([1, 2, 3]);
 
   isolate.port.receive((message, replyTo) {
     replyTo.send(responseFor(message), null);
   });
 }
 
 main() {
   useHtmlConfiguration();
   test('IsolateSpawn', () {
     isolate.spawnFunction(isolateEntry);
   });
   test('NonDOMIsolates', () {
     var callback = expectAsync0((){});
     var port = isolate.spawnFunction(isolateEntry);
     final msg1 = 'foo';
     final msg2 = 'bar';
     port.call(msg1).then((response) {
       guardAsync(() {
         expect(response, equals(responseFor(msg1)));
         port.call(msg2).then((response) {
           guardAsync(() {
             expect(response, equals(responseFor(msg2)));
             callback();
           });
         });
       });
     });
   });
 }