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

Translate AtScript in examples/e2e_test to TypeScript.

Closes #2294

modules/examples/e2e_test/material/progress_linear_spec.ts

@@ -0,0 +1,23 @@
+import {verifyNoBrowserErrors} from 'angular2/src/test_lib/e2e_util';
+
+describe('md-progress-linear', function() {
+  var url = 'examples/src/material/progress-linear/index.html';
+
+  beforeEach(() => { browser.get(url); });
+  afterEach(verifyNoBrowserErrors);
+
+  it('should increment and decrement progress', function() {
+    var progressBar = element.all(by.css('md-progress-linear')).first();
+    var incrementButton = element(by.id('increment'));
+    var decrementButton = element(by.id('decrement'));
+
+    var initialValue = progressBar.getAttribute('aria-valuenow');
+
+    incrementButton.click();
+    expect(progressBar.getAttribute('aria-valuenow')).toBeGreaterThan(initialValue);
+
+    decrementButton.click();
+    decrementButton.click();
+    expect(progressBar.getAttribute('aria-valuenow')).toBeLessThan(initialValue);
+  });
+});