Add LogoutConfirmationController to show LogoutConfirmationDialogs

ash/system/logout_confirmation/logout_confirmation_dialog.h

+// 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_LOGOUT_CONFIRMATION_LOGOUT_CONFIRMATION_DIALOG_H_
+#define ASH_SYSTEM_LOGOUT_CONFIRMATION_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;

[stevenjb, 2014/02/27 17:58:44]

clang format says:
 virtual base::string16 GetDialogButtonLabel(ui::DialogButton button) const
      OVERRIDE;

[bartfab (slow), 2014/02/28 12:13:49]

Either one is allowed by the style guide. I have no preference for one or the
other. Done.

+  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_LOGOUT_CONFIRMATION_LOGOUT_CONFIRMATION_DIALOG_H_