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..e08d76544e40147a356dcf875a1e5e35fe53447c 100644
--- a/chrome/renderer/render_widget.cc
+++ b/chrome/renderer/render_widget.cc
@@ -588,6 +588,7 @@ void RenderWidget::DoDeferredUpdate() {
 
   update_reply_pending_ = true;
   Send(new ViewHostMsg_UpdateRect(routing_id_, params));
+  Send(new ViewHostMsg_UpdateScrollOffset(routing_id_, GetScrollOffset()));
   next_paint_flags_ = 0;
 
   UpdateInputMethod();
@@ -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;