Tracing for NavigationHandle lifetime and state.

content/browser/devtools/page_navigation_throttle.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DEVTOOLS_PAGE_NAVIGATION_THROTTLE_H_
 #define CONTENT_BROWSER_DEVTOOLS_PAGE_NAVIGATION_THROTTLE_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/navigation_throttle.h"
 
 namespace content {
 namespace protocol {
 class PageHandler;
 }  // namespace protocol
 
 // Used to allow the DevTools client to optionally cancel navigations via the
 // Page.setControlNavigations and Page.processNavigation commands.
 class PageNavigationThrottle : public content::NavigationThrottle {
  public:
   PageNavigationThrottle(base::WeakPtr<protocol::PageHandler> page_handler,
                          int navigation_id,
                          content::NavigationHandle* navigation_handle);
   ~PageNavigationThrottle() override;
 
   // content::NavigationThrottle implementation:
   NavigationThrottle::ThrottleCheckResult WillStartRequest() override;
   NavigationThrottle::ThrottleCheckResult WillRedirectRequest() override;
+  const char* GetNameForLogging() override;
 
   int navigation_id() const { return navigation_id_; }
 
   // Tells the PageNavigationThrottle to not throttle anything!
   void AlwaysProceed();
 
   // Resumes a deferred navigation request. Does nothing if a response isn't
   // expected.
   void Resume();
 
@@ skipping 12 matching lines @@
   // Whether or not a navigation was deferred. If deferred we expect a
   // subsequent call to AlwaysProceed, Resume or CancelDeferredNavigation.
   bool navigation_deferred_;
 
   DISALLOW_COPY_AND_ASSIGN(PageNavigationThrottle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DEVTOOLS_PAGE_NAVIGATION_THROTTLE_H_