Change the visual appearance of panel on GTK per new UI design.

chrome/browser/ui/gtk/nine_box.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/gtk/nine_box.h"
 
 #include "base/basictypes.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 117 matching lines @@
 
   // The upper-left and lower-right corners of the center square in the
   // rendering of the ninebox.
   int x1 = gdk_pixbuf_get_width(images_[0]->ToGdkPixbuf());
   int y1 = gdk_pixbuf_get_height(images_[0]->ToGdkPixbuf());
   int x2 = images_[2] ? dst_width - gdk_pixbuf_get_width(
       images_[2]->ToGdkPixbuf()) : x1;
   int y2 = images_[6] ? dst_height - gdk_pixbuf_get_height(
       images_[6]->ToGdkPixbuf()) : y1;
   // Paint nothing if there's not enough room.
-  if (x2 < x1 || y2 < y1)
+  // Note that we still want to do the painting if there's room in only one

[jennb, 2012/06/04 22:17:52]

Are you sure this won't mess up non-panel uses of this method?

[jianli, 2012/06/05 18:48:30]

This change is not needed any more since we switched to drawing border via cairo
as suggested.

+  // dimension, like minimized panel consisting of 4-pixel lines.
+  if (x2 < x1 && y2 < y1)
     return;
 
   cairo_t* cr = gdk_cairo_create(GDK_DRAWABLE(gtk_widget_get_window(dst)));
   // For widgets that have their own window, the allocation (x,y) coordinates
   // are GdkWindow relative. For other widgets, the coordinates are relative
   // to their container.
   if (!gtk_widget_get_has_window(dst)) {
     // Transform our cairo from window to widget coordinates.
     cairo_translate(cr, allocation.x, allocation.y);
   }
@@ skipping 70 matching lines @@
     cairo_paint(flipped_cr);
     cairo_destroy(flipped_cr);
 
     // Mask the widget.
     gtk_widget_shape_combine_mask(widget, flipped_mask, 0, 0);
     g_object_unref(flipped_mask);
   }
 
   g_object_unref(mask);
 }