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

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_win.cc b/content/browser/renderer_host/render_widget_host_view_win.cc
index fcfeac8668a7e1e134a9dd0c43aa1c674a2b7eff..91f613847cbb1fbea8663eedc1f888dfb3412c4b 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -663,6 +663,10 @@ bool RenderWidgetHostViewWin::HasFocus() const {
   return ::GetFocus() == m_hWnd;
 }
 
+bool RenderWidgetHostViewWin::HasSurface() const {
+  return false;

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

return !!accelerated_surface_.get();

+}
+
 void RenderWidgetHostViewWin::Show() {
   if (!is_fullscreen_) {
     DCHECK(parent_hwnd_);