Add STATE_MAXIMIZED to the list of possible window states in MapWindow().

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

 // 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.
 
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 1533 matching lines @@
 
 std::list<XID>& DesktopWindowTreeHostX11::open_windows() {
   if (!open_windows_)
     open_windows_ = new std::list<XID>();
   return *open_windows_;
 }
 
 void DesktopWindowTreeHostX11::MapWindow(ui::WindowShowState show_state) {
   if (show_state != ui::SHOW_STATE_DEFAULT &&
       show_state != ui::SHOW_STATE_NORMAL &&
-      show_state != ui::SHOW_STATE_INACTIVE) {
+      show_state != ui::SHOW_STATE_INACTIVE &&
+      show_state != ui::SHOW_STATE_MAXIMIZED) {
     // It will behave like SHOW_STATE_NORMAL.
     NOTIMPLEMENTED();
   }
 
   // Before we map the window, set size hints. Otherwise, some window managers
   // will ignore toplevel XMoveWindow commands.
   XSizeHints size_hints;
   size_hints.flags = PPosition;
   size_hints.x = bounds_.x();
   size_hints.y = bounds_.y();
@@ skipping 361 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme(window);
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views