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diff --git a/ui/aura/desktop/desktop_activation_client.h b/ui/aura/desktop/desktop_activation_client.h
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+++ b/ui/aura/desktop/desktop_activation_client.h
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+// 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_AURA_DESKTOP_DESTKOP_ACTIVATION_CLIENT_H_
+#define UI_AURA_DESKTOP_DESTKOP_ACTIVATION_CLIENT_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "ui/aura/aura_export.h"
+#include "ui/aura/client/activation_client.h"
+#include "ui/aura/root_window_observer.h"
+
+namespace aura {
+class RootWindow;
+
+// An activation client that handles activation events in a single
+// RootWindow. Used only on the Desktop where there can be multiple RootWindow
+// objects.
+class AURA_EXPORT DesktopActivationClient : public client::ActivationClient,
+                                            public RootWindowObserver {
+ public:
+  explicit DesktopActivationClient(RootWindow* root_window);
+  virtual ~DesktopActivationClient();
+
+  // ActivationClient:
+  virtual void ActivateWindow(Window* window) OVERRIDE;
+  virtual void DeactivateWindow(Window* window) OVERRIDE;
+  virtual aura::Window* GetActiveWindow() OVERRIDE;
+  virtual bool OnWillFocusWindow(Window* window, const Event* event) OVERRIDE;
+  virtual bool CanActivateWindow(Window* window) const OVERRIDE;
+
+  // RootWindowObserver:
+  virtual void OnWindowFocused(aura::Window* window) OVERRIDE;
+
+ protected:
+  // Walks up the chain to find the correct parent window to activate when we
+  // try to activate |window|.
+  aura::Window* GetActivatableWindow(aura::Window* window);
+
+  // The root window that we handle.
+  RootWindow* root_window_;
+
+  // The current active window.
+  Window* current_active_;
+
+  // True inside ActivateWindow(). Used to prevent recursion of focus
+  // change notifications causing activation.
+  bool updating_activation_;
+
+  DISALLOW_COPY_AND_ASSIGN(DesktopActivationClient);
+};
+
+}  // namespace aura
+
+#endif  // UI_AURA_DESKTOP_DESTKOP_ACTIVATION_CLIENT_H_