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

chrome/browser/ui/ash/system_tray_client.h

Index: chrome/browser/ui/ash/system_tray_client.h
diff --git a/chrome/browser/ui/ash/system_tray_client.h b/chrome/browser/ui/ash/system_tray_client.h
index 23b79cd82d34f99eb0cc1832b4b1c68d1b4f9c7e..a63a2d30db462520af249ebb5f289af90eaeba9b 100644
--- a/chrome/browser/ui/ash/system_tray_client.h
+++ b/chrome/browser/ui/ash/system_tray_client.h
@@ -14,6 +14,11 @@ 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.
@@ -32,6 +37,12 @@ class SystemTrayClient : public ash::mojom::SystemTrayClient,
   // 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(
+      views::WidgetDelegate* widget_delegate);
+
   // ash::mojom::SystemTrayClient:
   void ShowSettings() override;
   void ShowDateSettings() override;