GTK: Make NineBox use CairoCachedSurfaces via gfx::Image.

chrome/browser/ui/gtk/nine_box.h

 // Copyright (c) 2011 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_GTK_NINE_BOX_H_
 #define CHROME_BROWSER_UI_GTK_NINE_BOX_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
+namespace gfx {
+class Image;
+}
+
 // A NineBox manages a set of source images representing a 3x3 grid, where
 // non-corner images can be tiled to make a larger image.  It's used to
 // use bitmaps for constructing image-based resizable widgets like buttons.
 //
 // If you want just a vertical image that stretches in height but is fixed
 // in width, only pass in images for the left column (leave others NULL).
 // Similarly, for a horizontal image that stretches in width but is fixed in
 // height, only pass in images for the top row.
-//
-// TODO(port): add support for caching server-side pixmaps of prerendered
-// nineboxes.
 class NineBox {
  public:
   // Construct a NineBox with nine images.  Images are specified using resource
   // ids that will be passed to the resource bundle.  Use 0 for no image.
   NineBox(int top_left, int top, int top_right, int left, int center, int right,
           int bottom_left, int bottom, int bottom_right);
 
   // Construct a NineBox from a single image and insets indicating the sizes
   // of the edges and corners.
   NineBox(int image, int top_margin, int bottom_margin, int left_margin,
           int right_margin);
   ~NineBox();
 
   // Render the NineBox to |dst|.
   // The images will be tiled to fit into the widget.
   void RenderToWidget(GtkWidget* dst) const;
 
   // As above, but rendered partially transparent.
   void RenderToWidgetWithOpacity(GtkWidget* dst, double opacity) const;
 
-  // Render the top row of images to |dst| between |x1| and |x1| + |width|.
-  // This is split from RenderToWidget so the toolbar can use it.
-  void RenderTopCenterStrip(cairo_t* cr, int x, int y, int width) const;
-
   // Set the shape of |widget| to match that of the ninebox. Note that |widget|
   // must have its own window and be allocated. Also, currently only the top
   // three images are used.
   // TODO(estade): extend this function to use all 9 images (if it's ever
   // needed).
   void ContourWidget(GtkWidget* widget) const;
 
  private:
-  GdkPixbuf* images_[9];
-  bool unref_pixbufs_on_destroy_;
+  gfx::Image* images_[9];
+  bool unref_images_on_destroy_;
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_NINE_BOX_H_