Draw background of Linux extension toolstrips.

chrome/browser/gtk/extension_shelf_gtk.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.
 
 #ifndef CHROME_BROWSER_GTK_EXTENSION_SHELF_GTK_H_
 #define CHROME_BROWSER_GTK_EXTENSION_SHELF_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include <set>
@@ skipping 39 matching lines @@
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
  private:
   class Toolstrip;
 
   // Create the contents of the extension shelf.
   void Init(Profile* profile);
 
+  // Lazily initialize background bitmap. Can be called many times.
+  void InitBackground();
+
   // Determines what is our target height and sets it.
   void AdjustHeight();
 
   void LoadFromModel();
 
   Toolstrip* ToolstripAtIndex(int index);
 
   // GtkHBox callbacks.
   static gboolean OnHBoxExpose(GtkWidget* widget, GdkEventExpose* event,
                                ExtensionShelfGtk* window);
 
   Browser* browser_;
 
   // Top level event box which draws the one pixel border.
   GtkWidget* top_border_;
 
   // Contains |shelf_hbox_|. Event box exists to prevent leakage of
   // background color from the toplevel application window's GDK window.
   OwnedWidgetGtk event_box_;
 
   // Used to position all children.
   GtkWidget* shelf_hbox_;
 
+  // Lazily-initialized background for toolstrips.
+  scoped_ptr<SkBitmap> background_;
+
   GtkThemeProvider* theme_provider_;
 
   // The model representing the toolstrips on the shelf.
   ExtensionShelfModel* model_;
 
   // Set of toolstrip views which are really on the shelf.
   std::set<Toolstrip*> toolstrips_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionShelfGtk);
 };
 
 #endif  // CHROME_BROWSER_EXTENSION_SHELF_GTK_H_