Add LogoutConfirmationController to show LogoutConfirmationDialogs

ash/system/logout_confirmation/logout_confirmation_controller.cc

+// Copyright 2014 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.
+
+#include "ash/system/logout_confirmation/logout_confirmation_controller.h"
+
+#include "ash/shell.h"
+#include "ash/system/logout_confirmation/logout_confirmation_dialog.h"
+#include "base/location.h"
+#include "base/time/tick_clock.h"
+
+namespace ash {
+namespace internal {
+
+LogoutConfirmationController::LogoutConfirmationController(
+    scoped_ptr<base::TickClock> clock,
+    const base::Closure& logout_closure)
+    : clock_(clock.Pass()),
+      logout_closure_(logout_closure),
+      dialog_(NULL),
+      logout_timer_(false, false) {
+}
+
+LogoutConfirmationController::~LogoutConfirmationController() {
+}
+
+base::TickClock* LogoutConfirmationController::Clock() const {
+  return clock_.get();
+}
+
+void LogoutConfirmationController::ConfirmLogout(
+    base::TimeTicks logout_time) {
+  if (!logout_time_.is_null() && logout_time >= logout_time_) {
+    // If a confirmation dialog is already being shown and its countdown expires
+    // no later than the |logout_time| requested now, keep the current dialog
+    // open.
+    return;
+  }
+  logout_time_ = logout_time;
+
+  if (!dialog_) {
+    // Show confirmation dialog unless this is a unit test without a Shell.
+    if (Shell::HasInstance())
+      dialog_ = new LogoutConfirmationDialog(this, logout_time_);
+  }
+  else

[stevenjb, 2014/02/27 17:58:44]

} else {

[bartfab (slow), 2014/02/28 12:13:49]

Done.

+    dialog_->Update(logout_time_);
+
+  logout_timer_.Start(FROM_HERE,
+                      logout_time_ - clock_->NowTicks(),
+                      logout_closure_);
+}
+
+void LogoutConfirmationController::OnLogoutConfirmed() {
+  logout_timer_.Stop();
+  logout_closure_.Run();
+}
+
+void LogoutConfirmationController::OnDialogClosed() {
+  logout_time_ = base::TimeTicks();
+  dialog_ = NULL;
+  logout_timer_.Stop();
+}
+
+}  // namespace internal
+}  // namespace ash