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 "base/macros.h"
+
+namespace base {
+template <typename T>
+struct DefaultSingletonTraits;
+}  // namespace base
+
+// A browser modal dialog that will prevent the browser windows that does not
+// own the modal dialog being activated. If there are multiple
+// BrowserModalDialog, only the browser window owns the oldest dialog will be
+// activated. Note that this dialog doesn't block other non-browser windows like
+// app window.
+class BrowserModalDialog {
+ public:
+  BrowserModalDialog();
+  ~BrowserModalDialog();
+
+  // Activate the modal dialog.
+  virtual void ActivateModalDialog() = 0;
+  // Return true if modal dialog is visible.
+  virtual bool IsShowing() = 0;
+};
+
+// The list of BrowserModalDialog.
+class BrowserModalDialogList {
+ public:
+  static BrowserModalDialogList* GetInstance();
+  void AddDialog(BrowserModalDialog* dialog);

[sky, 2017/05/16 12:40:32]

newline between 37/38. Also, document ownership.

[zmin, 2017/05/16 22:22:02]

Done.

+  void RemoveDialog(BrowserModalDialog* dialog);
+
+  // Activate the oldest BrowserModalDialog and return true. Return false if
+  // there is no visible dialog.
+  bool ActivateModalDialog();
+
+  // Return true if there is any BrowserModalDialog is visible.
+  bool IsShowing();
+
+  BrowserModalDialogList();

[sky, 2017/05/16 12:40:32]

style guide says constructor/destructor before other functions (including
statics).

[zmin, 2017/05/16 22:22:02]

Done.

+  ~BrowserModalDialogList();
+
+ private:
+  friend struct base::DefaultSingletonTraits<BrowserModalDialogList>;
+
+  std::list<BrowserModalDialog*> dialogs_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserModalDialogList);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_BROWSER_MODAL_DIALOG_H_