Support lists in <cr-settings-pref>

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<{key: string,
  *               type: chrome.settingsPrivate.PrefType,
  *               values: !Array<*>}>}
  * Test cases containing preference data. Each pref has three test values,
  * which can be used to change the pref. Intentionally, for a given pref, not
@@ skipping 17 matching lines @@
   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'],
 }, {
   key: 'profile.name',
   type: chrome.settingsPrivate.PrefType.STRING,
   values: ['Puppy', 'Puppy', 'Horsey'],
+}, {
+  key: 'content.sites',
+  type: chrome.settingsPrivate.PrefType.LIST,
+  // Arrays of dictionaries.
+  values: [
+    [{javascript: ['chromium.org', 'example.com'],
+      cookies: ['example.net'],
+      mic: ['example.com'],
+      flash: []},
+     {some: 4,
+      other: 8,
+      dictionary: 16}],
+    [{javascript: ['example.com', 'example.net'],
+      cookies: ['example.net', 'example.com'],
+      mic: ['example.com']},
+     {some: 4,
+      other: 8,
+      dictionary: 16}],
+    [{javascript: ['chromium.org', 'example.com'],
+      cookies: ['chromium.org', 'example.net', 'example.com'],
+      flash: ['localhost'],
+      mic: ['example.com']},
+     {some: 2.2,
+      dictionary: 4.4}]
+  ],
 }];