Separate the logic of popup alignment and workarea handling as delegate.

chrome/browser/ui/views/message_center/web_notification_tray.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_MESSAGE_CENTER_WEB_NOTIFICATION_TRAY_H_
 #define CHROME_BROWSER_UI_VIEWS_MESSAGE_CENTER_WEB_NOTIFICATION_TRAY_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/prefs/pref_member.h"
 #include "chrome/browser/status_icons/status_icon_menu_model.h"
@@ skipping 20 matching lines @@
 }
 
 namespace views {
 class Widget;
 }
 
 namespace message_center {
 
 struct PositionInfo;
 
+class DesktopPopupAlignmentDelegate;
 class MessageCenterWidgetDelegate;
 
 // A MessageCenterTrayDelegate implementation that exposes the MessageCenterTray
 // via a system tray icon.  The notification popups will be displayed in the
 // corner of the screen and the message center will be displayed by the system
 // tray icon on click.
 class WebNotificationTray : public message_center::MessageCenterTrayDelegate,
                             public StatusIconObserver,
                             public base::SupportsWeakPtr<WebNotificationTray>,
                             public StatusIconMenuModel::Delegate {
@@ skipping 55 matching lines @@
 
 #if defined(OS_WIN)
   // This member variable keeps track of whether EnforceStatusIconVisible has
   // been invoked on this machine, so the user still has control after we try
   // promoting it the first time.
   scoped_ptr<BooleanPrefMember> did_force_tray_visible_;
 #endif
 
   MessageCenterWidgetDelegate* message_center_delegate_;
   scoped_ptr<message_center::MessagePopupCollection> popup_collection_;
+  scoped_ptr<message_center::DesktopPopupAlignmentDelegate> alignment_delegate_;
 
   StatusIcon* status_icon_;
   StatusIconMenuModel* status_icon_menu_;
   scoped_ptr<MessageCenterTray> message_center_tray_;
   gfx::Point mouse_click_point_;
 
   bool should_update_tray_content_;
   bool last_quiet_mode_state_;
   base::string16 title_;
 
   DISALLOW_COPY_AND_ASSIGN(WebNotificationTray);
 };
 
 }  // namespace message_center
 
 #endif  // CHROME_BROWSER_UI_VIEWS_MESSAGE_CENTER_WEB_NOTIFICATION_TRAY_H_