Add skeletons for the factories to create the request coordinator and

chrome/browser/android/offline_pages/prerendering_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 CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_FACTORY_H_
+#define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_FACTORY_H_
+
+#include "base/macros.h"
+#include "components/offline_pages/background/offliner_factory.h"
+
+namespace content {
+class BrowserContext;
+}  // namespace content
+
+namespace offline_pages {
+
+class OfflinerPolicy;
+class Offliner;
+class PrerenderingOffliner;
+
+// A factory to create one unique PrerenderingOffliner.  Since the
+// PrerenderingOffliner is somewhat heavyweight and can use lots of memory, we
+// normally don't want more than one, and we can reuse the offliner for many
+// offlining sessions.
+class PrerenderingOfflinerFactory : public OfflinerFactory {
+ public:
+  explicit PrerenderingOfflinerFactory(content::BrowserContext* context);
+  ~PrerenderingOfflinerFactory() override;
+
+  Offliner* GetOffliner(const OfflinerPolicy* policy) override;
+
+ private:
+  // The offliner is owned by the factory, since it may be resued.
+  PrerenderingOffliner* offliner_;
+
+  // This is an unowned pointer, expected to stay valid for the lifetime of the
+  // factory.
+  content::BrowserContext* context_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrerenderingOfflinerFactory);
+};
+
+}  // namespace offline_pages
+
+#endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_FACTORY_H_