If force-sign-in policy is enabled, popup warning dialog before window closing if auth token becom…

chrome/browser/ui/views/browser_modal_dialog.h

+// Copyright 2017 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 CHROME_BROWSER_UI_VIEWS_BROWSER_MODAL_DIALOG_H_
+#define CHROME_BROWSER_UI_VIEWS_BROWSER_MODAL_DIALOG_H_
+
+#include <list>
+#include <memory>
+
+#include "base/macros.h"
+
+namespace base {
+template <typename T>
+struct DefaultSingletonTraits;
+}  // namespace base
+
+class AppModalDialogQueueWrapper;
+class Browser;
+
+// BrowserModalDialog prevents all browser windows from being actived. If there
+// are multiple BrowserModalDialog, only the browser window owns the oldest
+// dialog will get focus. Note that this dialog doesn't block other
+// non-browser windows like app window.
+class BrowserModalDialog {
+ public:
+  BrowserModalDialog();
+  virtual ~BrowserModalDialog();
+
+  // Activates the modal dialog when the window of |browser| tries to get focus.
+  virtual void ActivateModalDialog(Browser* browser) = 0;
+
+  // Returns true if modal dialog is visible.
+  virtual bool IsShowing() = 0;
+};
+
+// The list of BrowserModalDialogs.
+class BrowserModalDialogList {
+ public:
+  static BrowserModalDialogList* GetInstance();
+
+  // BrowserModalDialogList will not take the ownership of the dialog instance.
+  void AddDialog(BrowserModalDialog* dialog);
+
+  void RemoveDialog(BrowserModalDialog* dialog);
+
+  // Activates the oldest BrowserModalDialog when the window of |browser| tries
+  // to get focus.
+  void ActivateModalDialog(Browser* browser);
+
+  // Returns true if any BrowserModalDialogs are visible.
+  bool IsShowing();
+
+ private:
+  friend struct base::DefaultSingletonTraits<BrowserModalDialogList>;
+
+  BrowserModalDialogList();
+  ~BrowserModalDialogList();
+
+  std::list<BrowserModalDialog*> dialogs_;
+  std::unique_ptr<AppModalDialogQueueWrapper> wrapper_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserModalDialogList);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_BROWSER_MODAL_DIALOG_H_