Copy lib/dom tests that use dart:html to lib/html.

tests/dom/dom_isolates_test.dart

-#library('DOMIsolatesTest');
-#import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/html_config.dart');
-#import('dart:html');
-#import('dart:isolate');
-
-isolateMain(port) {
-  port.receive((msg, replyTo) {
-    if (msg != 'check') {
-      replyTo.send('wrong msg: $msg');
-    }
-    replyTo.send(window.location.toString());
-    port.close();
-  });
-}
-
-isolateMainTrampoline(port) {
-  final childPortFuture = spawnDomIsolate(window, 'isolateMain');
-  port.receive((msg, parentPort) {
-    childPortFuture.then((childPort) {
-      childPort.call(msg).then((response) {
-        parentPort.send(response);
-        port.close();
-      });
-    });
-  });
-}
-
-main() {
-  useHtmlConfiguration();
-
-  final iframe = new Element.tag('iframe');
-  document.body.nodes.add(iframe);
-
-  asyncTest('Simple DOM isolate test', 1, () {
-    spawnDomIsolate(iframe.contentWindow, 'isolateMain').then((sendPort) {
-      sendPort.call('check').then((msg) {
-        Expect.equals('about:blank', msg);
-        callbackDone();
-      });
-    });
-  });
-
-  asyncTest('Nested DOM isolates test', 1, () {
-    spawnDomIsolate(iframe.contentWindow, 'isolateMainTrampoline').then((sendPort) {
-      sendPort.call('check').then((msg) {
-        Expect.equals('about:blank', msg);
-        callbackDone();
-      });
-    });
-  });
-
-  test('Null as target window', () {
-    expectThrow(() => spawnDomIsolate(null, 'isolateMain'));
-  });
-
-  test('Not window as target window', () {
-    expectThrow(() => spawnDomIsolate(document, 'isolateMain'));
-  });
-}