Support plumbing LatencyInfo through the old software path.

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 35ed65408724afac9abe7671c9170f5f7541d356..042df2bb7840094d922bb5e0118591b39ef8a9ac 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -728,6 +728,8 @@ void RenderWidget::OnHandleInputEvent(const WebKit::WebInputEvent* input_event,
 
   if (compositor_)
     compositor_->SetLatencyInfo(latency_info);
+  else
+    latency_info_.MergeWith(latency_info);
 
   base::TimeDelta now = base::TimeDelta::FromInternalValue(
       base::TimeTicks::Now().ToInternalValue());
@@ -1212,6 +1214,11 @@ void RenderWidget::DoDeferredUpdate() {
   next_paint_flags_ = 0;
   need_update_rect_for_auto_resize_ = false;
 
+  if (!is_accelerated_compositing_active_)
+    pending_update_params_->latency_info = latency_info_;
+
+  latency_info_.Clear();
+
   if (update.scroll_rect.IsEmpty() &&
       !is_accelerated_compositing_active_ &&
       GetBitmapForOptimizedPluginPaint(bounds, &dib, &optimized_copy_location,