Plumb redirect info out of net, through content, and into child processes.

content/browser/loader/resource_dispatcher_host_impl.cc

 // Copyright (c) 2012 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <algorithm>
 #include <set>
@@ skipping 1034 matching lines @@
       GetContentClient()->browser()->OverrideCookieStoreForRenderProcess(
           child_id);
   scoped_ptr<net::URLRequest> new_request;
   new_request = request_context->CreateRequest(
       request_data.url, request_data.priority, NULL, cookie_store);
 
   new_request->set_method(request_data.method);
   new_request->set_first_party_for_cookies(
       request_data.first_party_for_cookies);
 
+  // If the request is a MAIN_FRAME request, the first-party URL gets updated on
+  // redirects.
+  if (request_data.resource_type == ResourceType::MAIN_FRAME) {
+    new_request->set_first_party_url_policy(
+        net::URLRequest::UPDATE_FIRST_PARTY_URL_ON_REDIRECT);
+  }
+
   const Referrer referrer(request_data.referrer, request_data.referrer_policy);
   SetReferrerForRequest(new_request.get(), referrer);
 
   net::HttpRequestHeaders headers;
   headers.AddHeadersFromString(request_data.headers);
   new_request->SetExtraRequestHeaders(headers);
 
   new_request->SetLoadFlags(load_flags);
 
   // Resolve elements from request_body and prepare upload data.
@@ skipping 931 matching lines @@
 
   // Add a flag to selectively bypass the data reduction proxy if the resource
   // type is not an image.
   if (request_data.resource_type != ResourceType::IMAGE)
     load_flags |= net::LOAD_BYPASS_DATA_REDUCTION_PROXY;
 
   return load_flags;
 }
 
 }  // namespace content