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

ash/system/logout_button/logout_button_tray.cc

Index: ash/system/logout_button/logout_button_tray.cc
diff --git a/ash/system/logout_button/logout_button_tray.cc b/ash/system/logout_button/logout_button_tray.cc
index c06073040c5c26822b641ecb479f29c65cae088f..d0559795144f3a499e2b2d545b52bcb444021617 100644
--- a/ash/system/logout_button/logout_button_tray.cc
+++ b/ash/system/logout_button/logout_button_tray.cc
@@ -24,7 +24,6 @@
 #include "ui/views/painter.h"
 
 namespace ash {
-
 namespace internal {
 
 namespace {
@@ -98,16 +97,42 @@ LogoutButtonTray::LogoutButtonTray(StatusAreaWidget* status_area_widget)
     : TrayBackgroundView(status_area_widget),
       button_(NULL),
       login_status_(user::LOGGED_IN_NONE),
-      show_logout_button_in_tray_(false) {
+      show_logout_button_in_tray_(false),
+      confirmation_delegate_(new LogoutConfirmationDialogView::Delegate) {
   button_ = new LogoutButton(this);
   tray_container()->AddChildView(button_);
   tray_container()->set_border(NULL);
-  Shell::GetInstance()->system_tray_notifier()->AddLogoutButtonObserver(this);
+  // The Shell may not exist in some unit tests.
+  if (Shell::HasInstance()) {
+    Shell::GetInstance()->system_tray_notifier()->
+        AddLogoutButtonObserver(this);
+  }
 }
 
 LogoutButtonTray::~LogoutButtonTray() {
-  Shell::GetInstance()->system_tray_notifier()->
-      RemoveLogoutButtonObserver(this);
+  EnsureConfirmationDialogIsClosed();
+  // The Shell may not exist in some unit tests.
+  if (Shell::HasInstance()) {
+    Shell::GetInstance()->system_tray_notifier()->
+        RemoveLogoutButtonObserver(this);
+  }
+}
+
+bool LogoutButtonTray::IsConfirmationDialogShowing() const {
+  return confirmation_dialog_;
+}
+
+void LogoutButtonTray::EnsureConfirmationDialogIsShowing() {
+  if (!confirmation_dialog_) {
+    confirmation_dialog_.reset(new LogoutConfirmationDialogView(
+          this, confirmation_delegate_.get()));

[bartfab (slow), 2013/12/17 13:21:03]

Nit: Indentation should be 4 characters from previous line, not 6.

[binjin, 2013/12/17 14:58:08]

Done.

+    confirmation_dialog_->Show(dialog_duration_);
+  }
+}
+
+void LogoutButtonTray::EnsureConfirmationDialogIsClosed() {
+  if (confirmation_dialog_)
+    confirmation_dialog_->Close();
 }
 
 void LogoutButtonTray::SetShelfAlignment(ShelfAlignment alignment) {
@@ -132,10 +157,20 @@ void LogoutButtonTray::OnShowLogoutButtonInTrayChanged(bool show) {
   UpdateVisibility();
 }
 
+void LogoutButtonTray::OnLogoutDialogDurationChanged(base::TimeDelta duration) {
+  dialog_duration_ = duration;
+  if (confirmation_dialog_)
+    confirmation_dialog_->UpdateDialogDuration(dialog_duration_);
+}
+
 void LogoutButtonTray::ButtonPressed(views::Button* sender,
                                      const ui::Event& event) {
   DCHECK_EQ(sender, button_);
-  Shell::GetInstance()->system_tray_delegate()->SignOut();
+  // Sign out immediately if |dialog_duration_| is non-positive.
+  if (dialog_duration_ <= base::TimeDelta())
+    confirmation_delegate_->LogoutCurrentUser();
+  else
+    EnsureConfirmationDialogIsShowing();
 }
 
 void LogoutButtonTray::UpdateAfterLoginStatusChange(
@@ -148,10 +183,30 @@ void LogoutButtonTray::UpdateAfterLoginStatusChange(
   UpdateVisibility();
 }
 
+void LogoutButtonTray::ReleaseConfirmationDialog() {
+  ignore_result(confirmation_dialog_.release());
+}
+
+LogoutConfirmationDialogView* LogoutButtonTray::GetConfirmationDialogForTest() {
+  return confirmation_dialog_.get();
+}
+
+LogoutConfirmationDialogView::Delegate*
+LogoutButtonTray::GetConfirmationDelegateForTest() {
+  return confirmation_delegate_.get();
+}
+
+void LogoutButtonTray::SetDelegateForTest(
+    scoped_ptr<LogoutConfirmationDialogView::Delegate> delegate) {
+  confirmation_delegate_ = delegate.Pass();
+}
+
 void LogoutButtonTray::UpdateVisibility() {
   SetVisible(show_logout_button_in_tray_ &&
              login_status_ != user::LOGGED_IN_NONE &&
              login_status_ != user::LOGGED_IN_LOCKED);
+  if (!show_logout_button_in_tray_)
+    EnsureConfirmationDialogIsClosed();
 }
 
 }  // namespace internal