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

ash/system/logout_button/logout_button_tray.h

Index: ash/system/logout_button/logout_button_tray.h
diff --git a/ash/system/logout_button/logout_button_tray.h b/ash/system/logout_button/logout_button_tray.h
index 5683e5e2654c13f52e1d2e9efe0a9403e91b9cf2..1fc713f1c142c7db5e11d8a6a746f2a63defcca4 100644
--- a/ash/system/logout_button/logout_button_tray.h
+++ b/ash/system/logout_button/logout_button_tray.h
@@ -5,11 +5,15 @@
 #ifndef ASH_SYSTEM_LOGOUT_BUTTON_LOGOUT_BUTTON_TRAY_H_
 #define ASH_SYSTEM_LOGOUT_BUTTON_LOGOUT_BUTTON_TRAY_H_
 
+#include "ash/ash_export.h"
 #include "ash/system/logout_button/logout_button_observer.h"
 #include "ash/system/tray/tray_background_view.h"
 #include "ash/system/user/login_status.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/time/time.h"
 #include "ui/views/controls/button/button.h"
 
 namespace views {
@@ -19,17 +23,23 @@ class LabelButton;
 namespace ash {
 namespace internal {
 
+class LogoutConfirmationDialogView;
+class LogoutConfirmationSettingsProvider;
 class StatusAreaWidget;
 
 // Adds a logout button to the launcher's status area if enabled by the
 // kShowLogoutButtonInTray pref.
-class LogoutButtonTray : public TrayBackgroundView,
+class ASH_EXPORT LogoutButtonTray : public TrayBackgroundView,
                          public LogoutButtonObserver,
                          public views::ButtonListener {
  public:
   explicit LogoutButtonTray(StatusAreaWidget* status_area_widget);
   virtual ~LogoutButtonTray();
 
+  void EnsureConfirmationDialogIsShowing();
+  void EnsureConfirmationDialogIsClosed();
+  bool IsConfirmationDialogShowing();
+
   // TrayBackgroundView:
   virtual void SetShelfAlignment(ShelfAlignment alignment) OVERRIDE;
   virtual base::string16 GetAccessibleNameForTray() OVERRIDE;
@@ -39,6 +49,7 @@ class LogoutButtonTray : public TrayBackgroundView,
 
   // LogoutButtonObserver:
   virtual void OnShowLogoutButtonInTrayChanged(bool show) OVERRIDE;
+  virtual void OnLogoutDialogDurationChanged(base::TimeDelta duration) OVERRIDE;
 
   // views::ButtonListener:
   virtual void ButtonPressed(views::Button* sender,
@@ -46,12 +57,22 @@ class LogoutButtonTray : public TrayBackgroundView,
 
   void UpdateAfterLoginStatusChange(user::LoginStatus login_status);
 
+  void DeleteConfirmationDialog();
+
+  void OnUserLogoutEvent();

[bartfab (slow), 2013/12/03 19:46:04]

This method name is rather cryptic. Also, the method is entirely unnecessary. It
gets invoked by ButtonPressed() and by tests. Why not simply have the tests call
ButtonPressed(), doing away with this method altogether?

[binjin, 2013/12/04 10:47:03]

The reason I didn't call ButtonPressed() directly is that there is a DCHECK_EQ
statement I don't want to remove or bypass it in ugly way. Can you suggest some
better method name?

[bartfab (slow), 2013/12/04 12:51:56]

You can make the test a friend of LogoutButtonTray. This would allow the test to
access the private button_ so that you can directly call
tray_->ButtonPressed(tray_->button_, ui::Event());

[binjin, 2013/12/05 10:08:05]

Done.

+
+  LogoutConfirmationDialogView* GetConfirmationDialog();

[bartfab (slow), 2013/12/03 19:46:04]

Nit: This is used in tests only. You could rename it to
GetConfirmationDialogForTest() to ensure it does not get called in production
code.

[binjin, 2013/12/04 10:47:03]

Done.

+
  private:
   void UpdateVisibility();
 
   views::LabelButton* button_;  // Not owned.
   user::LoginStatus login_status_;
   bool show_logout_button_in_tray_;
+  base::TimeDelta dialog_duration_;
+
+  scoped_ptr<LogoutConfirmationDialogView> confirmation_dialog_;
+  base::WeakPtrFactory<LogoutButtonTray> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LogoutButtonTray);
 };