Tracing for NavigationHandle lifetime and state.

content/browser/frame_host/mixed_content_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_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
 #define CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
 
 #include <set>
 
 #include "base/gtest_prod_util.h"
@@ skipping 28 matching lines @@
   static std::unique_ptr<NavigationThrottle> CreateThrottleForNavigation(
       NavigationHandle* navigation_handle);
 
   MixedContentNavigationThrottle(NavigationHandle* navigation_handle);
   ~MixedContentNavigationThrottle() override;
 
   // NavigationThrottle overrides.
   ThrottleCheckResult WillStartRequest() override;
   ThrottleCheckResult WillRedirectRequest() override;
   ThrottleCheckResult WillProcessResponse() override;
+  const char* GetNameForLogging() override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(MixedContentNavigationThrottleTest, IsMixedContent);
 
   // Copy of mixed content related values from the blink::UseCounter enum that
   // are needed to report feature usage during browser side checks.
   enum UseCounterFeature {
     MIXED_CONTENT_PRESENT = 609,
     MIXED_CONTENT_BLOCKABLE = 610,
     MIXED_CONTENT_INTERNAL = 615,
@@ skipping 29 matching lines @@
   // values are reported to the respective renderer process after each mixed
   // content check is finished.
   std::set<int> mixed_content_features_;
 
   DISALLOW_COPY_AND_ASSIGN(MixedContentNavigationThrottle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_