mash: Convert WebNotificationTray to wm common types

ui/message_center/views/popup_alignment_delegate.h

Index: ui/message_center/views/popup_alignment_delegate.h
diff --git a/ui/message_center/views/popup_alignment_delegate.h b/ui/message_center/views/popup_alignment_delegate.h
index f36deb6ac3ae5c35eac5c8bfce51dae8d7b20b1d..cba532ba0d3c36e0e68472e8e0fa1efa78622dbe 100644
--- a/ui/message_center/views/popup_alignment_delegate.h
+++ b/ui/message_center/views/popup_alignment_delegate.h
@@ -6,6 +6,7 @@
 #define UI_MESSAGE_CENTER_VIEWS_POPUP_ALIGNMENT_DELEGATE_H_
 
 #include "ui/message_center/message_center_export.h"
+#include "ui/views/widget/widget.h"
 
 namespace gfx {
 class Point;
@@ -50,6 +51,12 @@ class MESSAGE_CENTER_EXPORT PopupAlignmentDelegate {
   // so that the toasts are arranged at the correct place.
   virtual void RecomputeAlignment(const display::Display& display) = 0;
 
+  // Sets the parent container for popups. If it does not set a parent a
+  // default parent will be used (e.g. the native desktop on Windows).
+  virtual void ConfigureWidgetInitParamsForContainer(
+      views::Widget* widget,
+      views::Widget::InitParams* init_params) = 0;
+
  protected:
   virtual ~PopupAlignmentDelegate();