Tracing for NavigationHandle lifetime and state.

content/browser/devtools/page_navigation_throttle.cc

 // Copyright 2016 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 "content/browser/devtools/page_navigation_throttle.h"
 
 #include "base/strings/stringprintf.h"
 #include "content/browser/devtools/protocol/page_handler.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_process_host.h"
@@ skipping 26 matching lines @@
 
 NavigationThrottle::ThrottleCheckResult
 PageNavigationThrottle::WillRedirectRequest() {
   if (!page_handler_)
     return ThrottleCheckResult::PROCEED;
   navigation_deferred_ = true;
   page_handler_->NavigationRequested(this);
   return ThrottleCheckResult::DEFER;
 }
 
+const char* PageNavigationThrottle::GetNameForLogging() {
+  return "PageNavigationThrottle";
+}
+
 void PageNavigationThrottle::AlwaysProceed() {
   // Makes WillStartRequest and WillRedirectRequest always return
   // ThrottleCheckResult::PROCEED.
   page_handler_.reset();
 
   if (navigation_deferred_)
     Resume();
 }
 
 void PageNavigationThrottle::Resume() {
@@ skipping 11 matching lines @@
   if (!navigation_deferred_)
     return;
   navigation_deferred_ = false;
   navigation_handle()->CancelDeferredNavigation(result);
 
   // Do not add code after this as the PageNavigationThrottle may be deleted by
   // the line above.
 }
 
 }  // namespace content