Implement the new wallpaper manager launcher window.

chrome/browser/resources/chromeos/wallpaper_manager/js/window_state_manager.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.
+
+function WindowStateManager() {
+  this.savedWindow = [];
+}
+
+/**
+ * Minimize all opening windows and save their states.
+ */
+WindowStateManager.prototype.saveStates = function() {
+  var focusedWindowId;
+  chrome.windows.getLastFocused(function(focusedWindow) {
+    focusedWindowId = focusedWindow.id;
+  });
+  var self = this;
+  chrome.windows.getAll(null, function(windows) {
+    for (var i in windows) {
+      if (windows[i].state != 'minimized')

[flackr, 2012/07/09 21:29:58]

You should probably add this to the following condition and both update and save
the window to the list.

[bshe, 2012/07/10 01:39:22]

Done.

+        self.savedWindow.push(windows[i]);
+      if (windows[i].id != focusedWindowId)
+        chrome.windows.update(windows[i].id, {'state': 'minimized'},
+                              function() {});
+    }
+  });
+};
+
+/**
+ * Restore the states of all windows.
+ */
+WindowStateManager.prototype.restoreStates = function() {
+  for (var i in this.savedWindow) {
+     var state = this.savedWindow[i].state;
+     chrome.windows.update(this.savedWindow[i].id, {'state': state},
+                           function() {});
+  }
+};
+
+/**
+ * Remove the saved state of the current focused window.
+ */
+WindowStateManager.prototype.removeSavedState = function(windowId) {
+  for (var i in this.savedWindow) {
+    if (windowId == this.savedWindow[i].id)
+      this.savedWindow.splice(i, 1);
+  }
+};
+
+var windowStateManager = new WindowStateManager();
+
+// If a window gets focused before wallpaper manager close. The saved state
+// is no longer correct.
+chrome.windows.onFocusChanged.addListener(
+    windowStateManager.removeSavedState.bind(windowStateManager));