Sheriff-o-Matic: Convert some more ui tests to mocha

Tools/GardeningServer/ui/ct-results-comparison-zoomer-tests.html

-<!--
-Copyright 2014 The Chromium Authors. All rights reserved.
-Use of this source code is governed by a BSD-style license that can be
-found in the LICENSE file.
--->
-
-<link rel="import" href="ct-results-comparison-zoomer.html">
-
-<link rel="import" href="../base/ct-canvas-2d-context-mock.html">
-
-<script>
-(function () {
-
-module("ct-results-comparison-zoomer");
-
-asyncTest("no-position", 2, function() {
-  var zoomer = document.createElement('ct-results-comparison-zoomer');
-  // FIXME: This should set zoomer.position instead, but there's no way
-  // to get between the microtask and requestAnimationFrame to verify the
-  // behavior.
-  zoomer.positionChanged();
-  ok(zoomer._drawScheduled);
-
-  requestAnimationFrame(function() {
-    ok(!zoomer._drawScheduled);
-    start();
-  });
-});
-
-test("draw", 3, function() {
-  // Hard to verify correct behavior here, but at least make sure the
-  // code executes without throwing errors.
-
-  var zoomer = document.createElement('ct-results-comparison-zoomer');
-
-  try {
-    zoomer._drawAll();
-    ok(true);
-  } catch(e) {
-    ok(false);
-  }
-
-  // FIXME: Use a proper model class instead of a dumb object.
-  zoomer.position = {x: 0, y: 0};
-  try {
-    zoomer._drawAll();
-    ok(true);
-  } catch(e) {
-    ok(false);
-  }
-
-  try {
-    zoomer._draw(zoomer.$.diffZoomer);
-    ok(true);
-  } catch(e) {
-    ok(false);
-  }
-});
-
-asyncTest("drawCanvas", 1, function() {
-  var zoomer = document.createElement('ct-results-comparison-zoomer');
-  zoomer.position = {x: 0.2, y: 0.5};
-
-  requestAnimationFrame(function() {
-    var canvasContext = new CTCanvas2dContextMock();
-    zoomer._drawCanvas(canvasContext, zoomer.$.diffZoomer);
-
-    var expectedContext = new CTCanvas2dContextMock();
-    expectedContext.imageSmoothingEnabled = false;
-    expectedContext.translate(-960, -1800);
-    expectedContext.strokeRect(-1.5, -1.5, 4802, 3602);
-    expectedContext.scale(6, 6);
-    expectedContext.drawImage(zoomer.shadowRoot.querySelector('img'), 0, 0);
-    deepEqual(canvasContext, expectedContext);
-    start();
-  });
-});
-
-})()
-</script>