Tracing for NavigationHandle lifetime and state.

content/public/test/browser_test_utils.cc

Index: content/public/test/browser_test_utils.cc
diff --git a/content/public/test/browser_test_utils.cc b/content/public/test/browser_test_utils.cc
index ba92923e98dfdd189253b1acc1a9e2ae42957b1b..0864b5a2ae4d89bf797a839f21ec40f8e937e24a 100644
--- a/content/public/test/browser_test_utils.cc
+++ b/content/public/test/browser_test_utils.cc
@@ -347,6 +347,10 @@ class TestNavigationManagerThrottle : public NavigationThrottle {
         on_will_process_response_closure_(on_will_process_response_closure) {}
   ~TestNavigationManagerThrottle() override {}
 
+  const char* GetNameForLogging() override {
+    return "TestNavigationManagerThrottle";
+  }
+
  private:
   // NavigationThrottle:
   NavigationThrottle::ThrottleCheckResult WillStartRequest() override {