Add wallpaper experimental api framework and add a simple category list.

chrome/browser/resources/chromeos/wallpaper_manager/js/main.js

+// Copyright (c) 2012 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.
+
+/**
+ * Global wallpaperManager reference useful for poking at from the console.
+ */
+var wallpaperManager;
+
+/**
+ * Kick off the wallpaper manager dialog.
+ *
+ * Called by main.html after the dom has been parsed.

[flackr, 2012/05/26 14:16:45]

This doesn't seem to be true (anymore?). The addEventListener below is self
explanatory so you don't have to document this.

[bshe, 2012/05/29 16:07:11]

Sounds good. I will remove the comment here.

On 2012/05/26 14:16:45, flackr wrote:

+ */
+function init() {
+  WallpaperManager.initStrings(function() {
+    wallpaperManager = new WallpaperManager(document.body);
+  });
+}
+
+document.addEventListener('DOMContentLoaded', init);