Tracing for NavigationHandle lifetime and state.

components/subresource_filter/content/browser/subframe_navigation_filtering_throttle.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/subframe_navigation_filtering_throttle.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "content/public/browser/navigation_handle.h"
 
@@ skipping 14 matching lines @@
 content::NavigationThrottle::ThrottleCheckResult
 SubframeNavigationFilteringThrottle::WillStartRequest() {
   return DeferToCalculateLoadPolicy();
 }
 
 content::NavigationThrottle::ThrottleCheckResult
 SubframeNavigationFilteringThrottle::WillRedirectRequest() {
   return DeferToCalculateLoadPolicy();
 }
 
+const char* SubframeNavigationFilteringThrottle::GetNameForLogging() {
+  return "SubframeNavigationFilteringThrottle";
+}
+
 content::NavigationThrottle::ThrottleCheckResult
 SubframeNavigationFilteringThrottle::DeferToCalculateLoadPolicy() {
   parent_frame_filter_->GetLoadPolicyForSubdocument(
       navigation_handle()->GetURL(),
       base::Bind(&SubframeNavigationFilteringThrottle::OnCalculatedLoadPolicy,
                  weak_ptr_factory_.GetWeakPtr()));
   return content::NavigationThrottle::ThrottleCheckResult::DEFER;
 }
 
 void SubframeNavigationFilteringThrottle::OnCalculatedLoadPolicy(
     LoadPolicy policy) {
   // TODO(csharrison): Support WouldDisallow pattern and expose the policy for
   // metrics. Also, cancel with BLOCK_AND_COLLAPSE when it is implemented.
   if (policy == LoadPolicy::DISALLOW) {
     parent_frame_filter_->ReportDisallowedLoad();
     navigation_handle()->CancelDeferredNavigation(
         content::NavigationThrottle::CANCEL);
   } else {
     navigation_handle()->Resume();
   }
 }
 
 }  // namespace subresource_filter