Tracing for NavigationHandle lifetime and state.

content/public/test/navigation_simulator.cc

Index: content/public/test/navigation_simulator.cc
diff --git a/content/public/test/navigation_simulator.cc b/content/public/test/navigation_simulator.cc
index 33ae14213359fd3022f617241adfe66b5240a2c7..c457188f47454a8fa6a662b5604ed5ea449f7962 100644
--- a/content/public/test/navigation_simulator.cc
+++ b/content/public/test/navigation_simulator.cc
@@ -49,6 +49,10 @@ class NavigationThrottleCallbackRunner : public NavigationThrottle {
     return NavigationThrottle::PROCEED;
   }
 
+  const char* GetNameForLogging() override {
+    return "NavigationThrottleCallbackRunner";
+  }
+
  private:
   base::Closure on_will_start_request_;
   base::Closure on_will_redirect_request_;