Tracing for NavigationHandle lifetime and state.

chrome/browser/supervised_user/supervised_user_navigation_throttle.cc

Index: chrome/browser/supervised_user/supervised_user_navigation_throttle.cc
diff --git a/chrome/browser/supervised_user/supervised_user_navigation_throttle.cc b/chrome/browser/supervised_user/supervised_user_navigation_throttle.cc
index b0e6c8fc9576b80f8e45326e6a403650d335e40e..f3b535a88246dcf72e28698fe64952e1a5bb9d3c 100644
--- a/chrome/browser/supervised_user/supervised_user_navigation_throttle.cc
+++ b/chrome/browser/supervised_user/supervised_user_navigation_throttle.cc
@@ -200,6 +200,10 @@ SupervisedUserNavigationThrottle::WillRedirectRequest() {
   return CheckURL();
 }
 
+const char* SupervisedUserNavigationThrottle::GetNameForLogging() {
+  return "SupervisedUserNavigationThrottle";
+}
+
 void SupervisedUserNavigationThrottle::OnCheckDone(
     const GURL& url,
     SupervisedUserURLFilter::FilteringBehavior behavior,