Tracing for NavigationHandle lifetime and state.

components/subresource_filter/content/browser/subresource_filter_safe_browsing_activation_throttle.cc

 // Copyright (c) 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/subresource_filter_safe_browsing_activation_throttle.h"
 
 #include <vector>
 
 #include "base/timer/timer.h"
 #include "components/safe_browsing_db/v4_local_database_manager.h"
@@ skipping 104 matching lines @@
 content::NavigationThrottle::ThrottleCheckResult
 SubresourceFilterSafeBrowsingActivationThrottle::WillProcessResponse() {
   io_task_runner_->PostTask(
       FROM_HERE, base::Bind(&SubresourceFilterSafeBrowsingActivationThrottle::
                                 SBDatabaseClient::CheckUrlOnIO,
                             base::Unretained(database_client_.get()),
                             navigation_handle()->GetURL()));
   return content::NavigationThrottle::ThrottleCheckResult::DEFER;
 }
 
+const char*
+SubresourceFilterSafeBrowsingActivationThrottle::GetNameForLogging() {
+  return "SubresourceFilterSafeBrowsingActivationThrottle";
+}
+
 void SubresourceFilterSafeBrowsingActivationThrottle::OnCheckUrlResultOnUI(
     const GURL& url,
     safe_browsing::SBThreatType threat_type,
     safe_browsing::ThreatPatternType pattern_type) {
   content::WebContents* web_contents = navigation_handle()->GetWebContents();
   if (web_contents) {
     using subresource_filter::ContentSubresourceFilterDriverFactory;
     ContentSubresourceFilterDriverFactory* driver_factory =
         ContentSubresourceFilterDriverFactory::FromWebContents(web_contents);
     DCHECK(driver_factory);
 
     driver_factory->OnMainResourceMatchedSafeBrowsingBlacklist(
         url, std::vector<GURL>(), threat_type, pattern_type);
   }
   // TODO(https://crbug.com/704508): We should measure the delay introduces by
   // this check. Similarly, as it's done the Safe Browsing Resource throttle.
   navigation_handle()->Resume();
 }
 
 }  //  namespace subresource_filter