MD Settings: convert startup pages to use BrowserProxy/WebUIListeners

chrome/browser/resources/settings/on_startup_page/startup_urls_page_browser_proxy.js

Index: chrome/browser/resources/settings/on_startup_page/startup_urls_page_browser_proxy.js
diff --git a/chrome/browser/resources/settings/on_startup_page/startup_urls_page_browser_proxy.js b/chrome/browser/resources/settings/on_startup_page/startup_urls_page_browser_proxy.js
new file mode 100644
index 0000000000000000000000000000000000000000..3f9da830ac5b77fae550d1b766873610aba05f3b
--- /dev/null
+++ b/chrome/browser/resources/settings/on_startup_page/startup_urls_page_browser_proxy.js
@@ -0,0 +1,59 @@
+// Copyright 2016 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.
+
+cr.define('settings', function() {
+  /** @interface */
+  function StartupUrlsPageBrowserProxy() {}
+
+  StartupUrlsPageBrowserProxy.prototype = {
+    loadStartupPages: assertNotReached,
+
+    useCurrentPages: assertNotReached,
+
+    /** @param {string} url */
+    canAddPage: assertNotReached,
+
+    /** @param {string} url */
+    addStartupPage: assertNotReached,
+
+    /** @param {number} index */
+    removeStartupPage: assertNotReached,
+  };
+
+  /**
+   * @implements {settings.StartupUrlsPageBrowserProxy}
+   * @constructor
+   */
+  function StartupUrlsPageBrowserProxyImpl() {}
+
+  cr.addSingletonGetter(StartupUrlsPageBrowserProxyImpl);
+
+  StartupUrlsPageBrowserProxyImpl.prototype = {
+    loadStartupPages: function() {
+      chrome.send('onStartupPrefsPageLoad');
+    },
+
+    useCurrentPages: function() {
+      chrome.send('setStartupPagesToCurrentPages');
+    },
+
+    canAddPage: function(url) {
+      // TODO(dbeam): hook up to C++ for deeper validation.
+      return url.trim().length > 0;
+    },
+
+    addStartupPage: function(url) {
+      chrome.send('addStartupPage', [url.trim()]);
+    },
+
+    removeStartupPage: function(index) {
+      chrome.send('removeStartupPage', [index]);
+    },
+  };
+
+  return {
+    StartupUrlsPageBrowserProxy: StartupUrlsPageBrowserProxy,
+    StartupUrlsPageBrowserProxyImpl: StartupUrlsPageBrowserProxyImpl,
+  };
+});