Maximize windows when double clicking their title bar.

ui/aura_shell/window_util.h

+// 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.
+
+#ifndef UI_AURA_SHELL_WINDOW_UTIL_H_
+#define UI_AURA_SHELL_WINDOW_UTIL_H_
+#pragma once
+
+namespace aura {
+class Window;
+}
+
+namespace aura_shell {
+
+// Returns true if |window| is in the maximized state.
+bool IsWindowMaximized(aura::Window* window);
+
+}  // namespace aura_shell
+
+#endif  // UI_AURA_SHELL_WINDOW_UTIL_H_