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..dc39645db624e5fe2830a748b88606ea2500c990
--- /dev/null
+++ b/ash/system/logout_button/logout_confirmation_dialog_view.h
@@ -0,0 +1,80 @@
+// 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 "ash/ash_export.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 ASH_EXPORT LogoutConfirmationDialogView
+    : public views::DialogDelegateView {
+ public:
+  class ASH_EXPORT Delegate {
+   public:
+    Delegate() {}

[stevenjb, 2013/12/19 18:57:44]

Null constructors really shouldn't be necessary for interface classes.

[binjin, 2013/12/20 13:35:49]

Done.

+    virtual ~Delegate() {}
+
+    virtual void LogoutCurrentUser() = 0;
+    virtual base::TimeTicks GetCurrentTime() const = 0;
+    virtual void ShowDialog(views::DialogDelegate* dialog) = 0;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(Delegate);
+  };
+
+  LogoutConfirmationDialogView(LogoutButtonTray* owner, Delegate* delegate);
+  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;
+  virtual void OnClosed() OVERRIDE;
+  virtual void DeleteDelegate() OVERRIDE;
+
+  void Show(base::TimeDelta duration);
+
+  // The duration of the confirmation dialog can be changed while the dialog
+  // is still showing. This method is only expected to be called when the
+  // preference for confirmation dialog duration changed.

[stevenjb, 2013/12/19 18:57:44]

nit: 'changes' or 'has changed'

[binjin, 2013/12/20 13:35:49]

Done.

+  void UpdateDialogDuration(base::TimeDelta duration);
+
+ private:
+  void LogoutCurrentUser();
+  void UpdateCountdown();
+
+  views::Label* text_label_;
+
+  base::TimeTicks countdown_start_time_;
+  base::TimeDelta duration_;
+
+  base::RepeatingTimer<LogoutConfirmationDialogView> timer_;
+
+  LogoutButtonTray* owner_;
+
+  Delegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(LogoutConfirmationDialogView);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_LOGOUT_BUTTON_LOGOUT_CONFIRMATION_DIALOG_VIEW_H_