Crop images from custom themes before storing them into the theme pack

chrome/browser/ui/libgtk2ui/gtk2_ui.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 CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UI_H_
 #define CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UI_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 22 matching lines @@
   Gtk2UI();
   virtual ~Gtk2UI();
 
   // ui::LinuxShellDialog:
   virtual ui::SelectFileDialog* CreateSelectFileDialog(
       ui::SelectFileDialog::Listener* listener,
       ui::SelectFilePolicy* policy) const OVERRIDE;
 
   // ui::LinuxUI:
   virtual bool UseNativeTheme() const OVERRIDE;
-  virtual gfx::Image* GetThemeImageNamed(int id) const OVERRIDE;
+  virtual gfx::Image GetThemeImageNamed(int id) const OVERRIDE;
   virtual bool GetColor(int id, SkColor* color) const OVERRIDE;
   virtual ui::NativeTheme* GetNativeTheme() const OVERRIDE;
 
  private:
   typedef std::map<int, SkColor> ColorMap;
   typedef std::map<int, color_utils::HSL> TintMap;
   typedef std::map<int, gfx::Image*> ImageCache;
 
   // This method returns the colors webkit will use for the scrollbars. When no
   // colors are specified by the GTK+ theme, this function averages of the
@@ skipping 103 matching lines @@
 }  // namespace libgtk2ui
 
 // Access point to the GTK2 desktop system. This should be the only symbol that
 // is exported in the library; everything else should be used through the
 // interface, because eventually this .so will be loaded through dlopen at
 // runtime so our main binary can conditionally load GTK2 or GTK3 or EFL or
 // QT or whatever.
 LIBGTK2UI_EXPORT ui::LinuxUI* BuildGtk2UI();
 
 #endif  // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_UI_H_