Unify window fullscreen and minimizing implementation

ash/common/wm_window.cc

 // Copyright 2016 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 "ash/common/wm_window.h"
 
 #include "ash/aura/aura_layout_manager_adapter.h"
 #include "ash/aura/wm_shell_aura.h"
 #include "ash/common/ash_constants.h"
 #include "ash/common/shelf/shelf_item_types.h"
@@ skipping 748 matching lines @@
 
 void WmWindow::Activate() {
   wm::ActivateWindow(window_);
 }
 
 void WmWindow::Deactivate() {
   wm::DeactivateWindow(window_);
 }
 
 void WmWindow::SetFullscreen(bool fullscreen) {
-  if (fullscreen) {
-    window_->SetProperty(aura::client::kShowStateKey,
-                         ui::SHOW_STATE_FULLSCREEN);
-  } else {
-    auto state = window_->GetProperty(aura::client::kPreFullscreenShowStateKey);
-    DCHECK_NE(state, ui::SHOW_STATE_MINIMIZED);
-    window_->SetProperty(aura::client::kShowStateKey, state);
-    window_->ClearProperty(aura::client::kPreFullscreenShowStateKey);
-  }
+  ::wm::SetWindowFullscreen(window_, fullscreen);
 }
 
 void WmWindow::Maximize() {
   window_->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MAXIMIZED);
 }
 
 void WmWindow::Minimize() {
   window_->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MINIMIZED);
 }
 
@@ skipping 224 matching lines @@
     observer.OnTransientChildAdded(this, Get(transient));
 }
 
 void WmWindow::OnTransientChildRemoved(aura::Window* window,
                                        aura::Window* transient) {
   for (auto& observer : transient_observers_)
     observer.OnTransientChildRemoved(this, Get(transient));
 }
 
 }  // namespace ash