Tracing for NavigationHandle lifetime and state.

content/browser/frame_host/mixed_content_navigation_throttle.cc

Index: content/browser/frame_host/mixed_content_navigation_throttle.cc
diff --git a/content/browser/frame_host/mixed_content_navigation_throttle.cc b/content/browser/frame_host/mixed_content_navigation_throttle.cc
index ddb66f92dd912f5e9e6d1edabe44c6019e032b04..a267d39e9084fcf3f86fb684029d14e06694e3de 100644
--- a/content/browser/frame_host/mixed_content_navigation_throttle.cc
+++ b/content/browser/frame_host/mixed_content_navigation_throttle.cc
@@ -149,6 +149,10 @@ ThrottleCheckResult MixedContentNavigationThrottle::WillProcessResponse() {
   return ThrottleCheckResult::PROCEED;
 }
 
+const char* MixedContentNavigationThrottle::GetNameForLogging() {
+  return "MixedContentNavigationThrottle";
+}
+
 // Based off of MixedContentChecker::shouldBlockFetch.
 bool MixedContentNavigationThrottle::ShouldBlockNavigation(bool for_redirect) {
   NavigationHandleImpl* handle_impl =