Make the new JS interop test pass on Dartium.

lib/dom/templates/html/dartium/html_dartium.darttemplate

Index: lib/dom/templates/html/dartium/html_dartium.darttemplate
===================================================================
--- lib/dom/templates/html/dartium/html_dartium.darttemplate	(revision 9387)
+++ lib/dom/templates/html/dartium/html_dartium.darttemplate	(working copy)
@@ -8,6 +8,7 @@
 #library("html");
 
 #import("dart:isolate");
+#import("dart:json");
 #import("dart:nativewrappers");
 
 $!GENERATED_DART_FILES
@@ -26,6 +27,7 @@
 #source('$AUXILIARY_DIR/../../html/src/_Testing.dart');
 #source('$AUXILIARY_DIR/_ListIterators.dart');
 #source('$AUXILIARY_DIR/_Lists.dart');
+#source('$AUXILIARY_DIR/../../isolate/serialization.dart');
 
 #source('$AUXILIARY_DIR/native_DOMPublic.dart');
 #source('$AUXILIARY_DIR/native_DOMImplementation.dart');
@@ -62,3 +64,55 @@
 }
 
 final _null = const _Null();
+
+// TODO(vsm): Move this to a separate Isolates.dart file.
+_serialize(var message) {
+  // TODO(kasperl): Specialize the serializer.
+  return new _Serializer().traverse(message);
+}
+
+_deserialize(var message) {
+  return new _JsDeserializer().deserialize(message);
+}
+
+class _JsDeserializer extends _Deserializer {
+
+  deserializeSendPort(List x) {
+    num id = x[1];
+    return new _JsSendPortSync(id);
+  }
+
+}
+
+class _JsSendPortSync implements SendPortSync {
+
+  static bool initialized = false;
+  static var lastResult = null;
+
+  num _id;
+  _JsSendPortSync(this._id) {
+    if (initialized) return;
+    window.on['js-result'].add((event) {
+      lastResult = JSON.parse(event.data);
+    }, false);
+    initialized = true;
+  }
+
+  callSync(var message) {
+    var serialized = _serialize(message);
+    var result = _callUsingEvent(_id, serialized);
+    return _deserialize(result);
+  }
+
+  static _callUsingEvent(num id, var message) {
+    var data = JSON.stringify({ 'id': id, 'message': message });
+    var event = document.$dom_createEvent('TextEvent');
+    event.initTextEvent('js-sync-message', false, false, window, data);
+    assert(lastResult == null);
+    window.$dom_dispatchEvent(event);
+    var result = lastResult;
+    lastResult = null;
+    return result;
+  }
+
+}