Plumb network stack information about existence of cached copy

net/http/failing_http_transaction_factory.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 NET_FAILING_HTTP_TRANSACTION_FACTORY_H_
+#define NET_FAILING_HTTP_TRANSACTION_FACTORY_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "net/base/net_errors.h"
+#include "net/base/request_priority.h"
+#include "net/http/http_transaction.h"
+#include "net/http/http_transaction_factory.h"
+
+namespace net {
+
+class HttpCache;
+class HttpNetworkSession;
+
+// Creates transactions that always (asynchronously) return a specified
+// error.  The error is returned asynchronously, just after the transaction is
+// started.
+class NET_EXPORT FailingHttpTransactionFactory : public HttpTransactionFactory {
+ public:
+  // The caller must guarantee that |session| outlives this object.
+  FailingHttpTransactionFactory(HttpNetworkSession* session, Error error);
+  virtual ~FailingHttpTransactionFactory();
+
+  // HttpTransactionFactory:
+  virtual int CreateTransaction(
+      RequestPriority priority,
+      scoped_ptr<HttpTransaction>* trans) OVERRIDE;
+  virtual HttpCache* GetCache() OVERRIDE;
+  virtual HttpNetworkSession* GetSession() OVERRIDE;
+
+ private:
+  HttpNetworkSession* session_;
+  Error error_;
+};
+
+}  // namespace net
+
+#endif  // NET_FAILING_HTTP_TRANSACTION_FACTORY_H_