Prevent browser thumbnailer from trying to read from frontbuffer (surface texture) when none exists.

content/browser/renderer_host/render_widget_host_view_gtk.cc

Index: content/browser/renderer_host/render_widget_host_view_gtk.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_gtk.cc b/content/browser/renderer_host/render_widget_host_view_gtk.cc
index 15a007381aedb42bfcf0924521bde69bc67accd2..ae6d74e95d334e773bf9e7625cd774363308490e 100644
--- a/content/browser/renderer_host/render_widget_host_view_gtk.cc
+++ b/content/browser/renderer_host/render_widget_host_view_gtk.cc
@@ -734,6 +734,10 @@ bool RenderWidgetHostViewGtk::HasFocus() const {
   return gtk_widget_is_focus(view_.get());
 }
 
+bool RenderWidgetHostViewGtk::HasSurface() const {
+  return false;

[mazda, 2012/05/03 19:57:31]

return !!host_->GetBackingStore(false);

+}
+
 void RenderWidgetHostViewGtk::Show() {
   gtk_widget_show(view_.get());
 }