M57: Add UseCounter for ServiceWorkerNavigationPreload.

content/public/common/resource_response_info.h

 // Copyright 2014 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_PUBLIC_COMMON_RESOURCE_RESPONSE_INFO_H_
 #define CONTENT_PUBLIC_COMMON_RESOURCE_RESPONSE_INFO_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 160 matching lines @@
   uint16_t ssl_key_exchange_group;
 
   // List of Signed Certificate Timestamps (SCTs) and their corresponding
   // validation status. Only present if the renderer process set
   // report_raw_headers to true.
   net::SignedCertificateTimestampAndStatusList signed_certificate_timestamps;
 
   // In case this is a CORS response fetched by a ServiceWorker, this is the
   // set of headers that should be exposed.
   std::vector<std::string> cors_exposed_header_names;
+
+  // True if service worker navigation preload was performed due to the request
+  // for this response.
+  bool did_service_worker_navigation_preload;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_RESOURCE_RESPONSE_INFO_H_