Tracing for NavigationHandle lifetime and state.

components/subresource_filter/content/browser/activation_state_computing_navigation_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/activation_state_computing_navigation_throttle.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 79 matching lines @@
   }
 
   async_filter_ = base::MakeUnique<AsyncDocumentSubresourceFilter>(
       ruleset_handle_, std::move(params),
       base::Bind(&ActivationStateComputingNavigationThrottle::
                      OnActivationStateComputed,
                  weak_ptr_factory_.GetWeakPtr()));
   return content::NavigationThrottle::ThrottleCheckResult::DEFER;
 }
 
+const char* ActivationStateComputingNavigationThrottle::GetNameForLogging() {
+  return "ActivationStateComputingNavigationThrottle";
+}
+
 void ActivationStateComputingNavigationThrottle::OnActivationStateComputed(
     ActivationState state) {
   navigation_handle()->Resume();
 }
 
 // Ensure the caller cannot take ownership of a subresource filter for cases
 // when activation IPCs are not sent to the render process.
 std::unique_ptr<AsyncDocumentSubresourceFilter>
 ActivationStateComputingNavigationThrottle::ReleaseFilter() {
   return will_send_activation_to_renderer_ ? std::move(async_filter_) : nullptr;
 }
 
 void ActivationStateComputingNavigationThrottle::
     WillSendActivationToRenderer() {
   DCHECK(async_filter_);
   will_send_activation_to_renderer_ = true;
 }
 
 }  // namespace subresource_filter