Tracing for NavigationHandle lifetime and state.

components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.cc

 // 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.
 
 #include "components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "components/subresource_filter/content/browser/activation_state_computing_navigation_throttle.h"
@@ skipping 21 matching lines @@
       ContentSubresourceFilterThrottleManager::Delegate* delegate)
       : content::NavigationThrottle(handle), delegate_(delegate) {}
   ~ForwardingNavigationThrottle() override {}
 
   // content::NavigationThrottle:
   content::NavigationThrottle::ThrottleCheckResult WillProcessResponse()
       override {
     delegate_->WillProcessResponse(navigation_handle());
     return content::NavigationThrottle::PROCEED;
   }
+  const char* GetNameForLogging() override {
+    return "ForwardingNavigationThrottle";
+  }
 
  private:
   ContentSubresourceFilterThrottleManager::Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ForwardingNavigationThrottle);
 };
 
 }  // namespace
 
 bool ContentSubresourceFilterThrottleManager::Delegate::
@@ skipping 210 matching lines @@
   }
 }
 
 void ContentSubresourceFilterThrottleManager::OnDocumentLoadStatistics(
     const DocumentLoadStatistics& statistics) {
   if (statistics_)
     statistics_->OnDocumentLoadStatistics(statistics);
 }
 
 }  // namespace subresource_filter