feat(webworkers) Add MessageBus, Broker, and Serializer

modules/examples/e2e_test/message_broker/message_broker_spec.dart

@@ -0,0 +1,5 @@
+library examples.e2e_test.message_bus;
+
+main() {
+
+}

modules/examples/e2e_test/message_broker/message_broker_spec.ts

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+import {verifyNoBrowserErrors} from 'angular2/src/test_lib/e2e_util';
+import {PromiseWrapper} from "angular2/src/facade/async";
+
+var URL = 'examples/src/message_broker/index.html';
+
+describe('message bus', function() {
+
+  afterEach(verifyNoBrowserErrors);
+
+  it('should receive a response from the worker', function() {
+    browser.get(URL);
+
+    var VALUE = "hi there";
+    var input = element.all(by.css("#echo_input")).first();
+    input.sendKeys(VALUE);
+    clickComponentButton("body", "#send_echo");
+    browser.wait(protractor.until.elementLocated(protractor.By.css("#echo_result .response")),
+                 5000);
+    expect(getComponentText("#echo_result", ".response")).toEqual(VALUE);
+  });
+});
+
+describe('message broker', function() {
+  afterEach(verifyNoBrowserErrors);
+
+
+  it('should be able to run tasks on the UI thread after init', () => {
+    var VALUE = '5';
+
+    browser.get(URL);
+    browser.wait(protractor.until.elementLocated(protractor.By.css("#ui_result .result")), 5000);
+    expect(getComponentText("#ui_result", ".result")).toEqual(VALUE);
+  });
+});
+
+function getComponentText(selector, innerSelector) {
+  return browser.executeScript('return document.querySelector("' + selector + '").querySelector("' +
+                               innerSelector + '").textContent');
+}
+
+function clickComponentButton(selector, innerSelector) {
+  return browser.executeScript('return document.querySelector("' + selector + '").querySelector("' +
+                               innerSelector + '").click()');
+}