Tracing for NavigationHandle lifetime and state.

components/navigation_interception/intercept_navigation_throttle.h

 // Copyright 2015 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 COMPONENTS_NAVIGATION_INTERCEPTION_INTERCEPT_NAVIGATION_THROTTLE_H_
 #define COMPONENTS_NAVIGATION_INTERCEPTION_INTERCEPT_NAVIGATION_THROTTLE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 19 matching lines @@
       CheckCallback;
 
   InterceptNavigationThrottle(content::NavigationHandle* navigation_handle,
                               CheckCallback should_ignore_callback,
                               bool run_callback_synchronously);
   ~InterceptNavigationThrottle() override;
 
   // content::NavigationThrottle implementation:
   ThrottleCheckResult WillStartRequest() override;
   ThrottleCheckResult WillRedirectRequest() override;
+  const char* GetNameForLogging() override;
 
  private:
   ThrottleCheckResult CheckIfShouldIgnoreNavigation(bool is_redirect);
 
   // Called to perform the checks asynchronously
   void RunCallbackAsynchronously(const NavigationParams& navigation_params);
   // TODO(clamy): remove |throttle_was_destroyed| once crbug.com/570200 is
   // fixed.
   void OnAsynchronousChecksPerformed(bool should_ignore_navigation,
                                      bool throttle_was_destroyed);
 
   CheckCallback should_ignore_callback_;
 
   // Whether the callback will be run synchronously or not. If the callback can
   // lead to the destruction of the WebContents, this should be false.
   // Otherwise this should be true.
   const bool run_callback_synchronously_;
 
   base::WeakPtrFactory<InterceptNavigationThrottle> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InterceptNavigationThrottle);
 };
 
 }  // namespace navigation_interception
 
 #endif  // COMPONENTS_NAVIGATION_INTERCEPTION_INTERCEPT_NAVIGATION_THROTTLE_H_