mash: Introduce ShowWebDialogWithContainer for webui dialogs

chrome/browser/ui/ash/system_tray_delegate_chromeos.cc

 // Copyright 2013 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 "chrome/browser/ui/ash/system_tray_delegate_chromeos.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 331 matching lines @@
   GetUpdateInfo(UpgradeDetector::GetInstance(), info);
 }
 
 bool SystemTrayDelegateChromeOS::ShouldShowSettings() {
   ash::WmShell* wm_shell = ash::WmShell::Get();
   return ChromeUserManager::Get()->GetCurrentUserFlow()->ShouldShowSettings() &&
          !wm_shell->GetSessionStateDelegate()->IsInSecondaryLoginScreen();
 }
 
 void SystemTrayDelegateChromeOS::ShowSetTimeDialog() {
-  // TODO(mash): Refactor out GetNativeWindow and move to SystemTrayClient.
-  SetTimeDialog::ShowDialog(GetNativeWindow());
+  // TODO(mash): Move to SystemTrayClient.
+  SetTimeDialog::ShowDialogInContainer(
+      SystemTrayClient::GetDialogParentContainerId());
 }
 
 void SystemTrayDelegateChromeOS::ShowEnterpriseInfo() {
   // TODO(mash): Refactor out SessionStateDelegate and move to SystemTrayClient.
   ash::LoginStatus status = GetUserLoginStatus();
   ash::WmShell* wm_shell = ash::WmShell::Get();
   if (status == ash::LoginStatus::NOT_LOGGED_IN ||
       status == ash::LoginStatus::LOCKED ||
       wm_shell->GetSessionStateDelegate()->IsInSecondaryLoginScreen()) {
     scoped_refptr<chromeos::HelpAppLauncher> help_app(
@@ skipping 747 matching lines @@
   LOG(WARNING) << "SystemTrayDelegateChromeOS::GetChildUserMessage call while "
                << "ENABLE_SUPERVISED_USERS undefined.";
   return base::string16();
 }
 
 ash::SystemTrayDelegate* CreateSystemTrayDelegate() {
   return new SystemTrayDelegateChromeOS();
 }
 
 }  // namespace chromeos