chromeos: Make network enrollment and SIM unlock dialogs work with mash

chrome/browser/ui/ash/system_tray_client.h

 // Copyright 2016 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_ASH_SYSTEM_TRAY_CLIENT_H_
 #define CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_CLIENT_H_
 
 #include "ash/public/interfaces/system_tray.mojom.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/system/system_clock_observer.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace ash {
 enum class LoginStatus;
 }
 
+namespace views {
+class Widget;
+class WidgetDelegate;
+}
+
 // Handles method calls delegated back to chrome from ash. Also notifies ash of
 // relevant state changes in chrome.
 // TODO: Consider renaming this to SystemTrayClientChromeOS.
 class SystemTrayClient : public ash::mojom::SystemTrayClient,
                          public chromeos::system::SystemClockObserver {
  public:
   SystemTrayClient();
   ~SystemTrayClient() override;
 
   static SystemTrayClient* Get();
 
   // Returns the login state based on the user type, lock screen status, etc.
   static ash::LoginStatus GetUserLoginStatus();
 
   // Returns the container id for the parent window for new dialogs. The parent
   // varies based on the current login and lock screen state.
   static int GetDialogParentContainerId();
 
+  // Creates a modal dialog in the parent window for new dialogs on the primary
+  // display. See GetDialogParentContainerId() and views::CreateDialogWidget().
+  // The returned widget is owned by its native widget.
+  static views::Widget* CreateUnownedDialogWidget(

[James Cook, 2016/10/27 22:28:27]

The next CL will need this to return a Widget, even though the current CL does
not.

+      views::WidgetDelegate* widget_delegate);
+
   // ash::mojom::SystemTrayClient:
   void ShowSettings() override;
   void ShowDateSettings() override;
   void ShowSetTimeDialog() override;
   void ShowDisplaySettings() override;
   void ShowPowerSettings() override;
   void ShowChromeSlow() override;
   void ShowIMESettings() override;
   void ShowHelp() override;
   void ShowAccessibilityHelp() override;
@@ skipping 16 matching lines @@
   // Handles errors on the |system_tray_| interface connection.
   void OnClientConnectionError();
 
   // System tray mojo service in ash.
   ash::mojom::SystemTrayPtr system_tray_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayClient);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_CLIENT_H_