Implements the dialog view for logout button tray in public sessions.

ash/system/logout_button/logout_confirmation_dialog_view.h

Index: ash/system/logout_button/logout_confirmation_dialog_view.h
diff --git a/ash/system/logout_button/logout_confirmation_dialog_view.h b/ash/system/logout_button/logout_confirmation_dialog_view.h
new file mode 100644
index 0000000000000000000000000000000000000000..f29c5f748e2a245815ccc0d400e0ec0ed1bfee60
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+++ b/ash/system/logout_button/logout_confirmation_dialog_view.h
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+// Copyright (c) 2013 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_BUTTON_LOGOUT_CONFIRMATION_DIALOG_VIEW_H_
+#define ASH_SYSTEM_LOGOUT_BUTTON_LOGOUT_CONFIRMATION_DIALOG_VIEW_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 LogoutButtonTray;
+
+// This class implements dialog view for logout confirmation.
+class LogoutConfirmationDialogView
+    : public views::DialogDelegateView,
+      public base::SupportsWeakPtr<LogoutConfirmationDialogView> {
+ public:
+  LogoutConfirmationDialogView(LogoutButtonTray* owner);
+  virtual ~LogoutConfirmationDialogView();
+
+  // views::DialogDelegateView:
+  virtual bool Accept() OVERRIDE;
+  virtual ui::ModalType GetModalType() const OVERRIDE;
+  virtual string16 GetWindowTitle() const OVERRIDE;
+  virtual string16 GetDialogButtonLabel(ui::DialogButton button) const OVERRIDE;
+
+  void Show(base::TimeDelta duration);
+  void UpdateDialogDuration(base::TimeDelta duration);
+
+  void ClearOwner();
+
+ private:
+  void UpdateCountdown();
+
+  views::Label* text_label_;
+
+  base::TimeTicks countdown_start_time_;
+  base::TimeDelta duration_;
+
+  base::RepeatingTimer<LogoutConfirmationDialogView> timer_;
+
+  LogoutButtonTray* owner_;
+
+  DISALLOW_COPY_AND_ASSIGN(LogoutConfirmationDialogView);
+};
+
+}  // namespace internal
+
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_LOGOUT_BUTTON_LOGOUT_CONFIRMATION_DIALOG_VIEW_H_
+