Add Polymer tests for cr-settings-prefs

chrome/test/data/webui/settings/prefs_test_cases.js

+// Copyright 2015 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.
+
+/**
+ * @type {Array<Object>}

[Dan Beam, 2015/09/15 01:37:18]

Object -> {key: string, type: chrome.settingsPrivate.PrefType, values: Array<*>}

[michaelpg, 2015/09/15 02:20:53]

Done.

+ * Test cases containing preference data with three possible values per pref.

[Dan Beam, 2015/09/15 01:37:18]

can you expand on what values means?

[michaelpg, 2015/09/15 02:20:53]

Done.

+ */
+var prefsTestCases = [{
+  key: 'top_level_pref',
+  type: chrome.settingsPrivate.PrefType.BOOLEAN,
+  values: [true, false, true],
+}, {
+  key: 'browser.enable_flash',
+  type: chrome.settingsPrivate.PrefType.BOOLEAN,
+  values: [false, true, false],
+}, {
+  key: 'browser.enable_html5',
+  type: chrome.settingsPrivate.PrefType.BOOLEAN,
+  values: [true, false, false],
+}, {
+  key: 'device.overclock',
+  type: chrome.settingsPrivate.PrefType.NUMBER,
+  values: [0, .2, .6],
+}, {
+  key: 'browser.on.startup.homepage',
+  type: chrome.settingsPrivate.PrefType.STRING,
+  values: ['example.com', 'chromium.org', 'chrome.example.com'],
+}];