Tracing for NavigationHandle lifetime and state.

chrome/browser/page_load_metrics/metrics_navigation_throttle.cc

Index: chrome/browser/page_load_metrics/metrics_navigation_throttle.cc
diff --git a/chrome/browser/page_load_metrics/metrics_navigation_throttle.cc b/chrome/browser/page_load_metrics/metrics_navigation_throttle.cc
index 6eea79d87abeac6629647b84e7c3aad460e4c466..5548e0e9b567b885896b7b2ac58e5074cb72d1df 100644
--- a/chrome/browser/page_load_metrics/metrics_navigation_throttle.cc
+++ b/chrome/browser/page_load_metrics/metrics_navigation_throttle.cc
@@ -38,6 +38,10 @@ MetricsNavigationThrottle::WillProcessResponse() {
   return content::NavigationThrottle::PROCEED;
 }
 
+const char* MetricsNavigationThrottle::GetNameForLogging() {
+  return "MetricsNavigationThrottle";
+}
+
 MetricsNavigationThrottle::MetricsNavigationThrottle(
     content::NavigationHandle* handle)
     : content::NavigationThrottle(handle) {}