Hide popup custom notifications on non-primary displays

ui/message_center/views/popup_alignment_delegate.h

 // Copyright 2014 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 UI_MESSAGE_CENTER_VIEWS_POPUP_ALIGNMENT_DELEGATE_H_
 #define UI_MESSAGE_CENTER_VIEWS_POPUP_ALIGNMENT_DELEGATE_H_
 
 #include "ui/message_center/message_center_export.h"
 #include "ui/views/widget/widget.h"
 
@@ skipping 38 matching lines @@
   // The subclass may override this method to check the current desktop status
   // 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;
 
+  // Returns true if the display which notifications show on is the primary
+  // display.
+  virtual bool IsPrimaryDisplayForNotification() const = 0;
+
  protected:
   virtual ~PopupAlignmentDelegate();
 
   void DoUpdateIfPossible();
 
  private:
   MessagePopupCollection* collection_;
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_POPUP_ALIGNMENT_DELEGATE_H_