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..d6199d078aca54801b5f163fbfaf41c980f9a380
--- /dev/null
+++ b/ash/system/logout_button/logout_confirmation_dialog_view.h
@@ -0,0 +1,81 @@
+// 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/memory/weak_ptr.h"

[bartfab (slow), 2013/12/10 12:41:16]

Nit: Actually not needed once you remove |owner| and |owner_|.

[binjin, 2013/12/12 13:56:55]

Done.

+#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;

[bartfab (slow), 2013/12/10 12:41:16]

Nit: Actually not needed once you remove |owner| and |owner_|.

+class LogoutConfirmationDialogView;

[bartfab (slow), 2013/12/10 12:41:16]

Nit: This is not needed. You are about to declare the class two lines down :).

[binjin, 2013/12/12 13:56:55]

Done.

+
+// This class implements dialog view for logout confirmation.
+class ASH_EXPORT LogoutConfirmationDialogView :
+    public views::DialogDelegateView {
+ public:
+

[bartfab (slow), 2013/12/10 12:41:16]

Nit: No blank line needed here.

[binjin, 2013/12/12 13:56:55]

Done.

+  // This class provide setting and interface for LogoutConfirmationDialogView.
+  // It's supposed to be overridden for testing purpose.
+  class ASH_EXPORT LogoutConfirmationDelegate {
+   public:
+    LogoutConfirmationDelegate();
+    virtual ~LogoutConfirmationDelegate();
+
+    virtual void LogoutCurrentUser();
+    virtual base::TimeTicks GetCurrentTime();
+    virtual base::TimeDelta GetUpdateInterval();
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(LogoutConfirmationDelegate);
+  };
+
+  LogoutConfirmationDialogView(base::WeakPtr<LogoutButtonTray> owner,

[bartfab (slow), 2013/12/10 12:41:16]

Nit 1: As noted in my comment for LogoutButtonTray, the |owner| pointer is not
necessary.
Nit 2: Add a comment explaining the relationship between the lifetimes of |this|
and |delegate|. Right now, the relationship is wrong (|this| may access
|delegate| when it is no longer valid) but once you fix this, you can say that
|delegate| must live until the dialog is closed.

+                               LogoutConfirmationDelegate* delegate);
+  virtual ~LogoutConfirmationDialogView();
+
+  // views::DialogDelegateView:
+  virtual void DeleteDelegate() OVERRIDE;
+  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);
+
+ private:
+  void LogoutCurrentUser();
+  void UpdateCountdown();
+
+  views::Label* text_label_;
+
+  base::TimeTicks countdown_start_time_;
+  base::TimeDelta duration_;
+
+  base::RepeatingTimer<LogoutConfirmationDialogView> timer_;
+
+  base::WeakPtr<LogoutButtonTray> owner_;

[bartfab (slow), 2013/12/10 12:41:16]

Nit: As noted in my comment for LogoutButtonTray, the |owner_| pointer is not
necessary.

+
+  LogoutConfirmationDelegate* delegate_; // Not owned

[bartfab (slow), 2013/12/10 12:41:16]

Nit 1: No need for the "Not owned" comment. I know I was using it a lot myself
but I have since been convinced by others that it is a bad idea.
Nit 2: Comments should end with a full stop.
Nit 3: There should be two spaces before an inline comment.

[binjin, 2013/12/12 13:56:55]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(LogoutConfirmationDialogView);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_LOGOUT_BUTTON_LOGOUT_CONFIRMATION_DIALOG_VIEW_H_