Maintain the current renderer_hang_count in Stability.Counts.

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index e45cab8f129f17b302f7d0d80bb81df2160e5e42..dcf0459a254fff7770c276437d69489a6be499e8 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -956,6 +956,12 @@ void RenderViewHostImpl::RenderViewReady() {
 }
 
 void RenderViewHostImpl::ClosePageTimeout() {
+  // Temporarily fire "hung" events to keep the renderer_hang_count from
+  // Stability.Counts stable.
+  NotificationService::current()->Notify(NOTIFICATION_RENDER_WIDGET_HOST_HANG,
+                                         Source<RenderWidgetHost>(nullptr),
+                                         NotificationService::NoDetails());
+
   if (delegate_->ShouldIgnoreUnresponsiveRenderer())
     return;