Paint a focus indication on LinkButtonGtk buttons....

chrome/common/gtk_util.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_COMMON_GTK_UTIL_H_
 #define CHROME_COMMON_GTK_UTIL_H_
 
 #include <gtk/gtk.h>
 
 #include "base/gfx/point.h"
 #include "base/gfx/rect.h"
 #include "webkit/glue/window_open_disposition.h"
 
 typedef struct _GtkWidget GtkWidget;
 
 namespace event_utils {
 
 // Translates event flags into what kind of disposition they represent.
 // For example, a middle click would mean to open a background tab.
 // event_flags are the state in the GdkEvent structure.
 WindowOpenDisposition DispositionFromEventFlags(guint state);
 
 }  // namespace event_utils
 
 namespace gtk_util {
 
-  // Create a GtkBin with |child| as its child widget.  This bin will paint a
+// Create a GtkBin with |child| as its child widget.  This bin will paint a
 // border of color |color| with the sizes specified in pixels.
 GtkWidget* CreateGtkBorderBin(GtkWidget* child, const GdkColor* color,
                               int top, int bottom, int left, int right);
 
 // Remove all children from this container.
 void RemoveAllChildren(GtkWidget* container);
 
 // Force the font size of the widget to |size_pixels|.
 void ForceFontSizePixels(GtkWidget* widget, double size_pixels);
 
 // Gets the position of a gtk widget in screen coordinates.
 gfx::Point GetWidgetScreenPosition(GtkWidget* widget);
 
 // Returns the bounds of the specified widget in screen coordinates.
 gfx::Rect GetWidgetScreenBounds(GtkWidget* widget);
 
 // Initialize some GTK settings so that our dialogs are consistent.
 void InitRCStyles();
 
+// Stick the widget in the given hbox without expanding vertically. The widget
+// is packed at the start of the hbox. This is useful for widgets that would
+// otherwise expand to fill the vertical space of the hbox (e.g. buttons).
+void CenterWidgetInHBox(GtkWidget* hbox, GtkWidget* widget, bool pack_at_end,
+                        int padding);
+
 }  // namespace gtk_util
 
 #endif  // CHROME_COMMON_GTK_UTIL_H_