Add LogoutConfirmationController to show LogoutConfirmationDialogs

ash/system/session/logout_confirmation_dialog.h

Index: ash/system/session/logout_confirmation_dialog.h
diff --git a/ash/system/session/logout_confirmation_dialog.h b/ash/system/session/logout_confirmation_dialog.h
new file mode 100644
index 0000000000000000000000000000000000000000..d133fd78a56ca3c7f8cdda4065a3b9b141bb6429
--- /dev/null
+++ b/ash/system/session/logout_confirmation_dialog.h
@@ -0,0 +1,59 @@
+// Copyright 2014 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 ASH_SYSTEM_SESSION_LOGOUT_CONFIRMATION_DIALOG_H_
+#define ASH_SYSTEM_SESSION_LOGOUT_CONFIRMATION_DIALOG_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "ui/views/window/dialog_delegate.h"
+
+namespace views {
+class Label;
+}
+
+namespace ash {
+namespace internal {
+
+class LogoutConfirmationController;
+
+// A dialog that asks the user to confirm or deny logout. The dialog shows a
+// countdown and informs the user that a logout will happen automatically if no
+// choice is made before the countdown has expired.
+class LogoutConfirmationDialog : public views::DialogDelegateView {
+ public:
+  LogoutConfirmationDialog(LogoutConfirmationController* controller,
+                           base::TimeTicks logout_time);
+  virtual ~LogoutConfirmationDialog();
+
+  void Update(base::TimeTicks logout_time);
+
+  // views::DialogDelegateView:
+  virtual bool Accept() OVERRIDE;
+  virtual ui::ModalType GetModalType() const OVERRIDE;
+  virtual base::string16 GetWindowTitle() const OVERRIDE;
+  virtual base::string16 GetDialogButtonLabel(ui::DialogButton button) const
+      OVERRIDE;
+  virtual void OnClosed() OVERRIDE;
+  virtual void DeleteDelegate() OVERRIDE;
+
+ private:
+  void UpdateLabel();
+
+  LogoutConfirmationController* controller_;
+  base::TimeTicks logout_time_;
+
+  views::Label* label_;
+
+  base::RepeatingTimer<LogoutConfirmationDialog> update_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(LogoutConfirmationDialog);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_SESSION_LOGOUT_CONFIRMATION_DIALOG_H_