refactor(examples/e2e_test): Ts'ifying examples/e2_test

Translate AtScript in examples/e2e_test to TypeScript.

Closes #2294

modules/examples/e2e_test/material/radio_spec.ts

@@ -0,0 +1,21 @@
+import {verifyNoBrowserErrors} from 'angular2/src/test_lib/e2e_util';
+
+describe('md-radio-button', function() {
+  var url = 'examples/src/material/radio/index.html';
+
+  beforeEach(() => { browser.get(url); });
+  afterEach(verifyNoBrowserErrors);
+
+  it('should check one radio button and then check another', () => {
+    var standaloneRadios = element.all(by.css('[name="element"]'));
+    var firstRadio = standaloneRadios.first();
+    var lastRadio = standaloneRadios.last();
+
+    firstRadio.click();
+    expect(firstRadio.getAttribute('aria-checked')).toEqual('true');
+
+    lastRadio.click();
+    expect(firstRadio.getAttribute('aria-checked')).toEqual('false');
+    expect(lastRadio.getAttribute('aria-checked')).toEqual('true');
+  });
+});