Tracing for NavigationHandle lifetime and state.

chrome/browser/chromeos/arc/intent_helper/arc_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_CHROMEOS_ARC_INTENT_HELPER_ARC_NAVIGATION_THROTTLE_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_INTENT_HELPER_ARC_NAVIGATION_THROTTLE_H_
 
 #include <memory>
 #include <string>
 #include <utility>
@@ skipping 85 matching lines @@
   // do not have Chrome, returns false.
   static bool IsSwapElementsNeeded(
       const std::vector<mojom::IntentHandlerInfoPtr>& handlers,
       std::pair<size_t, size_t>* out_indices);
 
   static bool IsAppAvailableForTesting(
       const std::vector<mojom::IntentHandlerInfoPtr>& handlers);
   static size_t FindPreferredAppForTesting(
       const std::vector<mojom::IntentHandlerInfoPtr>& handlers);
 
+  // content::Navigation implementation:
+  const char* GetNameForLogging() override;
+
  private:
   // content::Navigation implementation:
   NavigationThrottle::ThrottleCheckResult WillStartRequest() override;
   NavigationThrottle::ThrottleCheckResult WillRedirectRequest() override;
 
   NavigationThrottle::ThrottleCheckResult HandleRequest();
   void OnAppCandidatesReceived(
       std::vector<mojom::IntentHandlerInfoPtr> handlers);
   void OnAppIconsReceived(
       std::vector<mojom::IntentHandlerInfoPtr> handlers,
@@ skipping 18 matching lines @@
 
   // This has to be the last member of the class.
   base::WeakPtrFactory<ArcNavigationThrottle> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcNavigationThrottle);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_INTENT_HELPER_ARC_NAVIGATION_THROTTLE_H_