Generate thumbnails in the browser process.

chrome/renderer/render_widget.cc

Index: chrome/renderer/render_widget.cc
diff --git a/chrome/renderer/render_widget.cc b/chrome/renderer/render_widget.cc
index 7fb9e4a9aa2f97405775896678c02a38464b32cc..ba01020ad31e6567c86105c4537f7d7b49075598 100644
--- a/chrome/renderer/render_widget.cc
+++ b/chrome/renderer/render_widget.cc
@@ -585,6 +585,7 @@ void RenderWidget::DoDeferredUpdate() {
   params.resizer_rect = resizer_rect_;
   params.plugin_window_moves.swap(plugin_window_moves_);
   params.flags = next_paint_flags_;
+  params.scroll_offset = GetScrollOffset();
 
   update_reply_pending_ = true;
   Send(new ViewHostMsg_UpdateRect(routing_id_, params));
@@ -920,6 +921,11 @@ webkit::ppapi::PluginInstance* RenderWidget::GetBitmapForOptimizedPluginPaint(
   return NULL;
 }
 
+gfx::Size RenderWidget::GetScrollOffset() {
+  // Bare RenderWidgets don't support scroll offset.
+  return gfx::Size(0, 0);
+}
+
 void RenderWidget::SetHidden(bool hidden) {
   if (is_hidden_ == hidden)
     return;