Tracing for NavigationHandle lifetime and state.

content/browser/frame_host/data_url_navigation_throttle.h

 // 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_DATA_URL_NAVIGATION_THROTTLE_
 #define CONTENT_BROWSER_FRAME_HOST_DATA_URL_NAVIGATION_THROTTLE_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "content/public/browser/navigation_throttle.h"
 
 namespace content {
 
 class DataUrlNavigationThrottle : public NavigationThrottle {
  public:
   explicit DataUrlNavigationThrottle(NavigationHandle* navigation_handle);
   ~DataUrlNavigationThrottle() override;
 
   // NavigationThrottle method:
   ThrottleCheckResult WillProcessResponse() override;
+  const char* GetNameForLogging() override;
 
   static std::unique_ptr<NavigationThrottle> CreateThrottleForNavigation(
       NavigationHandle* navigation_handle);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DataUrlNavigationThrottle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_DATA_URL_NAVIGATION_THROTTLE_