Tracing for NavigationHandle lifetime and state.

components/subresource_filter/content/browser/subframe_navigation_filtering_throttle.h

 // Copyright 2017 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_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBFRAME_NAVIGATION_FILTERING_THROTTLE_H_
 #define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBFRAME_NAVIGATION_FILTERING_THROTTLE_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/subresource_filter/content/browser/async_document_subresource_filter.h"
@@ skipping 19 matching lines @@
  public:
   SubframeNavigationFilteringThrottle(
       content::NavigationHandle* handle,
       AsyncDocumentSubresourceFilter* parent_frame_filter);
   ~SubframeNavigationFilteringThrottle() override;
 
   // content::NavigationThrottle:
   content::NavigationThrottle::ThrottleCheckResult WillStartRequest() override;
   content::NavigationThrottle::ThrottleCheckResult WillRedirectRequest()
       override;
+  const char* GetNameForLogging() override;
 
  private:
   content::NavigationThrottle::ThrottleCheckResult DeferToCalculateLoadPolicy();
   void OnCalculatedLoadPolicy(LoadPolicy policy);
 
   // Must outlive this class.
   AsyncDocumentSubresourceFilter* parent_frame_filter_;
 
   base::WeakPtrFactory<SubframeNavigationFilteringThrottle> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SubframeNavigationFilteringThrottle);
 };
 
 }  // namespace subresource_filter
 
 #endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_SUBFRAME_NAVIGATION_FILTERING_THROTTLE_H_