aura-mus: Implement Deactivate().

ui/views/widget/desktop_aura/desktop_window_tree_host.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_H_
 
 #include <memory>
 
 #include "ui/aura/window_event_dispatcher.h"
@@ skipping 39 matching lines @@
   // It is expected this calls InitHost() on the WindowTreeHost.
   virtual void Init(aura::Window* content_window,
                     const Widget::InitParams& params) = 0;
 
   // Invoked once the DesktopNativeWidgetAura has been created.
   virtual void OnNativeWidgetCreated(const Widget::InitParams& params) = 0;
 
   // Called from DesktopNativeWidgetAura::OnWidgetInitDone().
   virtual void OnWidgetInitDone() = 0;
 
+  // Called from DesktopNativeWidgetAura::OnWindowActivated().
+  virtual void OnNativeWidgetActivationChanged(bool active) = 0;
+
   // Creates and returns the Tooltip implementation to use. Return value is
   // owned by DesktopNativeWidgetAura and lives as long as
   // DesktopWindowTreeHost.
   virtual std::unique_ptr<corewm::Tooltip> CreateTooltip() = 0;
 
   // Creates and returns the DragDropClient implementation to use. Return value
   // is owned by DesktopNativeWidgetAura and lives as long as
   // DesktopWindowTreeHost.
   virtual std::unique_ptr<aura::client::DragDropClient> CreateDragDropClient(
       DesktopNativeCursorManager* cursor_manager) = 0;
@@ skipping 92 matching lines @@
 
   // A return value of true indicates DesktopNativeCursorManager should be
   // used, a return value of false indicates the DesktopWindowTreeHost manages
   // cursors itself.
   virtual bool ShouldUseDesktopNativeCursorManager() const = 0;
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_H_