Added Dartium changes onto 45.0.2454.104

LayoutTests/dart/dom/DOMMap.dart

+import 'package:expect/expect.dart';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+import 'dart:html';
+import 'dart:isolate';
+
+main() {
+  useHtmlConfiguration(true);
+  test('ElementsIdentity', () {
+    DivElement div = new Element.tag('div');
+    div.id = 'test';
+    document.body.nodes.add(div);
+
+    Element element = document.query('#test');
+    Expect.identical(div, element);
+  });
+  test('TwoIsolates', () {
+    // Test that we can access the same DOM nodes from different isolates.
+    // FIXME: uncomment when we have DOM isolates.
+    /*
+    SendPort port = spawnFunction(isolateEntry);
+    Element testDiv = document.query('#test_div');
+    Expect.equals('Hello from Dart Frame', testDiv.innerHtml);
+    document.body.removeChild(testDiv);
+    */
+  });
+}
+
+void isolateEntry() {
+  Element element = new Element.tag('div');
+  element.id = 'test_div';
+  element.innerHtml = 'Hello from Dart isolate';
+  document.body.nodes.add(element);
+}