time metric: record elapsed time from when the backgrounded and purged renderer is foregrounded unti

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 22efa3fc2ce31a756670a866cf9c6d334cf9c722..209ca71eacb3428755cd260066b6ce48644bd9e9 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -923,6 +923,8 @@ void RenderWidget::RequestScheduleAnimation() {
 
 void RenderWidget::UpdateVisualState() {
   GetWebWidget()->updateAllLifecyclePhases();
+  if (RenderThreadImpl* render_thread = RenderThreadImpl::current())

[esprehn, 2017/01/25 03:22:17]

How can the thread be null if we're inside UpdateVisualState() ?

[tasak, 2017/01/26 09:39:40]

I'm afraid that some unittests creates RenderWidget without any
RenderThreadImpl. However, all trybots seem to pass. I think, we don't need this
check.

Done.

+    render_thread->OnPostWidgetUpdateVisualState();
 }
 
 void RenderWidget::WillBeginCompositorFrame() {