Stop notifications from being clipped on resize.

ui/message_center/views/message_center_view.h

 // Copyright (c) 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 UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
@@ skipping 44 matching lines @@
   size_t NumMessageViewsForTest() const;
 
   void SetSettingsVisible(bool visible);
   void OnSettingsChanged();
   bool settings_visible() const { return settings_visible_; }
   MessageCenterTray* tray() { return tray_; }
 
   void SetIsClosing(bool is_closing);
 
  protected:
+  // Potentially sets the reposition target, and then returns whether or not it
+  // was was set.
+  virtual bool SetRepositionTarget();
+
   // Overridden from views::View:
   void Layout() override;
   gfx::Size GetPreferredSize() const override;
   int GetHeightForWidth(int width) const override;
   bool OnMouseWheel(const ui::MouseWheelEvent& event) override;
   void OnMouseExited(const ui::MouseEvent& event) override;
 
   // Overridden from MessageCenterObserver:
   void OnNotificationAdded(const std::string& id) override;
   void OnNotificationRemoved(const std::string& id, bool by_user) override;
@@ skipping 75 matching lines @@
   Mode mode_ = Mode::BUTTONS_ONLY;
 
   std::unique_ptr<MessageViewContextMenuController> context_menu_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenterView);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_