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

chrome/browser/ui/gtk/nine_box.cc

Index: chrome/browser/ui/gtk/nine_box.cc
diff --git a/chrome/browser/ui/gtk/nine_box.cc b/chrome/browser/ui/gtk/nine_box.cc
index 7bce50447fc76e0483e4ca32c735eaeb7fefabd4..815b350d81a31fa7582b7a350ad78fd906a3f0ec 100644
--- a/chrome/browser/ui/gtk/nine_box.cc
+++ b/chrome/browser/ui/gtk/nine_box.cc
@@ -135,7 +135,9 @@ void NineBox::RenderToWidgetWithOpacity(GtkWidget* dst, double opacity) const {
   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)));