For notifications, use the same shadow border that the autocomplete dropdown ...

chrome/browser/views/notifications/balloon_view.h

 // Copyright (c) 2009 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.
 
 // Draws the view for the balloons.
 
 #ifndef CHROME_BROWSER_VIEWS_NOTIFICATIONS_BALLOON_VIEW_H_
 #define CHROME_BROWSER_VIEWS_NOTIFICATIONS_BALLOON_VIEW_H_
 
 #include "app/menus/simple_menu_model.h"
@@ skipping 84 matching lines @@
 
   // AnimationDelegate interface.
   virtual void AnimationProgressed(const Animation* animation);
 
   // Launches the options menu at screen coordinates |pt|.
   void RunOptionsMenu(const gfx::Point& pt);
 
   // Initializes the options menu.
   void CreateOptionsMenu();
 
-  // How to mask the balloon contents to fit within the frame.
-  // Populates |path| with the outline.
+  // Masks the contents to fit within the frame.
   void GetContentsMask(const gfx::Rect& contents_rect, gfx::Path* path) const;
 
+  // Masks the frame for the rounded corners of the shadow-bubble.
+  void GetFrameMask(const gfx::Rect&, gfx::Path* path) const;
+
   // Adjust the contents window size to be appropriate for the frame.
   void SizeContentsWindow();
 
   // Do the delayed close work.
   void DelayedClose(bool by_user);
 
   // The height of the balloon's shelf.
   // The shelf is where is close button is located.
   int GetShelfHeight() const;
 
@@ skipping 27 matching lines @@
   // The window that contains the contents of the notification.
   // Pointer owned by the View subclass.
   views::Widget* html_container_;
 
   // The renderer of the HTML contents.
   scoped_ptr<BalloonViewHost> html_contents_;
 
   // The following factory is used to call methods at a later time.
   ScopedRunnableMethodFactory<BalloonViewImpl> method_factory_;
 
-  // Image painters for the frame of the toast.
-  scoped_ptr<views::Painter> shelf_background_;
-  scoped_ptr<views::Painter> balloon_background_;
-
   // Pointer to sub-view is owned by the View sub-class.
   views::ImageButton* close_button_;
 
   // Pointer to sub-view is owned by View class.
   views::Label* source_label_;
 
   // An animation to move the balloon on the screen as its position changes.
   scoped_ptr<SlideAnimation> animation_;
   gfx::Rect anim_frame_start_;
   gfx::Rect anim_frame_end_;
 
   // The options menu.
   scoped_ptr<menus::SimpleMenuModel> options_menu_contents_;
   scoped_ptr<views::Menu2> options_menu_menu_;
   views::MenuButton* options_menu_button_;
 
   NotificationRegistrar notification_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(BalloonViewImpl);
 };
 
 #endif  // CHROME_BROWSER_VIEWS_NOTIFICATIONS_BALLOON_VIEW_H_