Bug 1333720 - Support Unknown/Unsupported widget type 13 and 17. r=karlt

--HG--
extra : rebase_source : 352781ae7ea9a890de752045923c86718abf763f

widget/gtk/gtk2drawing.c

@@ -2972,7 +2972,9 @@ moz_gtk_get_widget_border(WidgetNodeType widget, gint* left, gint* top,
     case MOZ_GTK_RADIOBUTTON:
     case MOZ_GTK_SCROLLBAR_BUTTON:
     case MOZ_GTK_SCROLLBAR_HORIZONTAL:
+    case MOZ_GTK_SCROLLBAR_TROUGH_HORIZONTAL:
     case MOZ_GTK_SCROLLBAR_VERTICAL:
+    case MOZ_GTK_SCROLLBAR_TROUGH_VERTICAL:
     case MOZ_GTK_SCROLLBAR_THUMB_HORIZONTAL:
     case MOZ_GTK_SCROLLBAR_THUMB_VERTICAL:
     case MOZ_GTK_SCALE_THUMB_HORIZONTAL:
@@ -3229,6 +3231,10 @@ moz_gtk_widget_paint(WidgetNodeType widget, GdkDrawable* drawable,
         return moz_gtk_scrollbar_trough_paint(widget, drawable, rect,
                                               cliprect, state, direction);
         break;
+    case MOZ_GTK_SCROLLBAR_TROUGH_HORIZONTAL:
+    case MOZ_GTK_SCROLLBAR_TROUGH_VERTICAL:
+        return MOZ_GTK_SUCCESS;
+        break;
     case MOZ_GTK_SCROLLBAR_THUMB_HORIZONTAL:
     case MOZ_GTK_SCROLLBAR_THUMB_VERTICAL:
         return moz_gtk_scrollbar_thumb_paint(widget, drawable, rect,