Keep track of how many documents had a resource intercepted by foreign fetch.

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 100 matching lines @@
 
   // NPN protocol negotiated with the server.
   std::string npn_negotiated_protocol;
 
   // Remote address of the socket which fetched this resource.
   net::HostPortPair socket_address;
 
   // True if the response was fetched by a ServiceWorker.
   bool was_fetched_via_service_worker;
 
+  // True if the response was fetched by a foreign fetch ServiceWorker;
+  bool was_fetched_via_foreign_fetch;
+
   // True when the request whoes mode is |CORS| or |CORS-with-forced-preflight|
   // is sent to a ServiceWorker but FetchEvent.respondWith is not called. So the
   // renderer have to resend the request with skip service worker flag
   // considering the CORS preflight logic.
   bool was_fallback_required_by_service_worker;
 
   // The original URL of the response which was fetched by the ServiceWorker.
   // This may be empty if the response was created inside the ServiceWorker.
   GURL original_url_via_service_worker;
 
@@ skipping 31 matching lines @@
   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;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_RESOURCE_RESPONSE_INFO_H_