Add skeletons for the factories to create the request coordinator and

components/offline_pages/background/offliner_factory.h

+// Copyright 2016 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 COMPONENTS_OFFLINE_PAGES_BACKGROUND_OFFLINER_FACTORY_H_
+#define COMPONENTS_OFFLINE_PAGES_BACKGROUND_OFFLINER_FACTORY_H_
+
+#include "base/macros.h"
+
+namespace offline_pages {
+
+class OfflinerPolicy;
+class Offliner;
+
+// An interface to a factory which can create a background offliner.
+// The returned factory is owned by the offliner, which is allowed to cache the
+// factory and return it again later.
+class OfflinerFactory {
+ public:
+  virtual Offliner* GetOffliner(const OfflinerPolicy* policy);
+
+  OfflinerFactory() {}
+  virtual ~OfflinerFactory() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(OfflinerFactory);
+};
+
+}  // namespace offline_pages
+
+#endif  // COMPONENTS_OFFLINE_PAGES_BACKGROUND_OFFLINER_FACTORY_H_