Introduce ResourceRequesterInfo to abstract the requester of resource request

content/browser/loader/async_revalidation_manager.cc

 // Copyright 2015 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.
 
 #include "content/browser/loader/async_revalidation_manager.h"
 
 #include <tuple>
 #include <utility>
 
 #include "base/logging.h"
@@ skipping 40 matching lines @@
   DCHECK(in_progress_.empty());
 }
 
 void AsyncRevalidationManager::BeginAsyncRevalidation(
     const net::URLRequest& for_request,
     ResourceScheduler* scheduler) {
   DCHECK_EQ(for_request.url_chain().size(), 1u);
   const ResourceRequestInfoImpl* info =
       ResourceRequestInfoImpl::ForRequest(&for_request);
   DCHECK(info);
-  if (!info->filter()) {
+  if (!info->requester_info().IsRenderer() ||
+      !info->requester_info().filter()) {
     // The child has gone away and we can no longer get ResourceContext and
     // URLRequestContext to perform async revalidation.
     // This can happen in the following cases, ordered from bad to not-so-bad
     //
     // 1. PlzNavigate (but enabling PlzNavigate automatically disables
     //    stale-while-revalidate; see crbug.com/561609)
     // 2. <link rel=prefetch> may read a stale cache entry without a
     //    revalidation being performed if the original renderer goes away. This
     //    is a lost optimisation opportunity.
     //
@@ skipping 10 matching lines @@
     //
     // TODO(ricea): Resolve these lifetime issues. crbug.com/561591
     return;
   }
 
   ResourceContext* resource_context = nullptr;
   net::URLRequestContext* request_context = nullptr;
 
   // The embedder of //content needs to ensure that the URLRequestContext object
   // remains valid until after the ResourceContext object is destroyed.
-  info->filter()->GetContexts(info->GetResourceType(), &resource_context,
-                              &request_context);
+  info->requester_info().GetContexts(info->GetResourceType(), &resource_context,
+                                     &request_context);
 
   AsyncRevalidationKey async_revalidation_key(
       resource_context, request_context->http_transaction_factory()->GetCache(),
       for_request.url());
   std::pair<AsyncRevalidationMap::iterator, bool> insert_result =
       in_progress_.insert(AsyncRevalidationMap::value_type(
           async_revalidation_key, std::unique_ptr<AsyncRevalidationDriver>()));
   if (!insert_result.second) {
     // A matching async revalidation is already in progress for this cache; we
     // don't need another one.
@@ skipping 80 matching lines @@
 
   return true;
 }
 
 void AsyncRevalidationManager::OnAsyncRevalidationComplete(
     AsyncRevalidationMap::iterator it) {
   in_progress_.erase(it);
 }
 
 }  // namespace content