Adds OnChildWindowVisibilityChanged to ui::WindowObserver

ash/mus/bridge/wm_window_mus.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/mus/bridge/wm_window_mus.h"
 
 #include "ash/common/shelf/shelf_item_types.h"
 #include "ash/common/wm/container_finder.h"
 #include "ash/common/wm/window_positioning_utils.h"
 #include "ash/common/wm/window_state.h"
@@ skipping 942 matching lines @@
 }
 
 void WmWindowMus::OnWindowDestroying(ui::Window* window) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_, OnWindowDestroying(this));
 }
 
 void WmWindowMus::OnWindowDestroyed(ui::Window* window) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_, OnWindowDestroyed(this));
 }
 
-void WmWindowMus::OnWindowVisibilityChanging(ui::Window* window) {
+void WmWindowMus::OnWindowVisibilityChanging(ui::Window* window, bool visible) {
   DCHECK_EQ(window_, window);
   FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowVisibilityChanging(this, !window->visible()));
+                    OnWindowVisibilityChanging(this, visible));
 }
 
-void WmWindowMus::OnWindowVisibilityChanged(ui::Window* window) {
+void WmWindowMus::OnWindowVisibilityChanged(ui::Window* window, bool visible) {
   FOR_EACH_OBSERVER(WmWindowObserver, observers_,
-                    OnWindowVisibilityChanged(Get(window), window->visible()));
+                    OnWindowVisibilityChanged(Get(window), visible));
 }
 
 void WmWindowMus::OnTransientChildAdded(ui::Window* window,
                                         ui::Window* transient) {
   FOR_EACH_OBSERVER(WmTransientWindowObserver, transient_observers_,
                     OnTransientChildAdded(this, Get(transient)));
 }
 
 void WmWindowMus::OnTransientChildRemoved(ui::Window* window,
                                           ui::Window* transient) {
   FOR_EACH_OBSERVER(WmTransientWindowObserver, transient_observers_,
                     OnTransientChildRemoved(this, Get(transient)));
 }
 
 }  // namespace mus
 }  // namespace ash