Maximize windows when double clicking their title bar.

ui/aura_shell/window_util.cc

+// Copyright (c) 2011 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.
+
+#include "ui/aura_shell/window_util.h"
+
+#include "ui/aura/window.h"
+#include "ui/aura/client/aura_constants.h"
+#include "ui/base/ui_base_types.h"
+
+namespace aura_shell {
+
+bool IsWindowMaximized(aura::Window* window) {
+  return window->GetIntProperty(aura::kShowStateKey) ==
+      ui::SHOW_STATE_MAXIMIZED;
+}
+
+}  // namespace aura_shell