aura-mus: Implement Deactivate().

ui/aura/mus/window_manager_delegate.h

 // Copyright 2015 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_MUS_WINDOW_MANAGER_DELEGATE_H_
 #define UI_AURA_MUS_WINDOW_MANAGER_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 130 matching lines @@
       const base::Callback<void(bool)>& on_done) = 0;
 
   virtual void OnWmCancelMoveLoop(Window* window) = 0;
 
   // Called when then client changes the client area of a window.
   virtual void OnWmSetClientArea(
       Window* window,
       const gfx::Insets& insets,
       const std::vector<gfx::Rect>& additional_client_areas) = 0;
 
+  // Returns whether |window| is the current active window.
+  virtual bool IsWindowActive(Window* window) = 0;
+
+  // Called when a client requests that its activation be given to another
+  // window.
+  virtual void OnWmDeactivateWindow(Window* window) = 0;
+
  protected:
   virtual ~WindowManagerDelegate() {}
 };
 
 }  // namespace ui
 
 #endif  // UI_AURA_MUS_WINDOW_MANAGER_DELEGATE_H_