Add a sampling tracing to RenderWidget::DoDeferredUpdate

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 bb06cfe956eaafc0f7e210d0a5f394ea25c9ea6a..52c4682e780b3010e525dd73bbfd6b20c5669c86 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1099,6 +1099,10 @@ void RenderWidget::DoDeferredUpdateAndSendInputAck() {
 
 void RenderWidget::DoDeferredUpdate() {
   TRACE_EVENT0("renderer", "RenderWidget::DoDeferredUpdate");
+// Not supported in split-dll build. http://crbug.com/256965
+#if !defined(CHROME_SPLIT_DLL)

[nduca, 2013/07/03 09:54:34]

can we push the disable call into the implementation of the macros? E.g. leave
the callsite alone and have the macro be a nop?

[haraken, 2013/07/04 02:03:16]

Done.

+  TRACE_EVENT_SAMPLING_STATE_SCOPE("Chrome", "Paint");
+#endif
 
   if (!webwidget_)
     return;