Tracing for NavigationHandle lifetime and state.

chrome/browser/supervised_user/supervised_user_google_auth_navigation_throttle.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_GOOGLE_AUTH_NAVIGATION_THROTTLE_H_
 #define CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_GOOGLE_AUTH_NAVIGATION_THROTTLE_H_
 
 #include <memory>
 
 #include "base/callback_list.h"
@@ skipping 11 matching lines @@
  public:
   // Returns a new throttle for the given navigation handle, or nullptr if no
   // throttling is required.
   static std::unique_ptr<SupervisedUserGoogleAuthNavigationThrottle>
   MaybeCreate(content::NavigationHandle* navigation_handle);
 
   ~SupervisedUserGoogleAuthNavigationThrottle() override;
 
   ThrottleCheckResult WillStartRequest() override;
   ThrottleCheckResult WillRedirectRequest() override;
+  const char* GetNameForLogging() override;
 
  private:
   SupervisedUserGoogleAuthNavigationThrottle(
       Profile* profile,
       content::NavigationHandle* navigation_handle);
 
   void OnGoogleAuthStateChanged(bool authenticated);
 
   ThrottleCheckResult WillStartOrRedirectRequest();
 
   ThrottleCheckResult ShouldProceed(bool authenticated);
 
   void OnReauthenticationResult(bool reauth_successful);
 
   ChildAccountService* child_account_service_;
   std::unique_ptr<base::CallbackList<void(bool)>::Subscription>
       google_auth_state_subscription_;
 
 #if defined(OS_ANDROID)
   bool has_shown_reauth_;
 #endif
 
   base::WeakPtrFactory<SupervisedUserGoogleAuthNavigationThrottle>
       weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserGoogleAuthNavigationThrottle);
 };
 
 #endif  // CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_GOOGLE_AUTH_NAVIGATION_THROTTLE_H_