Add skeletons for the factories to create the request coordinator and

chrome/browser/android/offline_pages/request_coordinator_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_REQUEST_COORDINATOR_FACTORY_H_
+#define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_REQUEST_COORDINATOR_FACTORY_H_
+
+#include "base/macros.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+#include "content/public/browser/browser_context.h"
+
+namespace base {
+template <typename T>
+struct DefaultSingletonTraits;
+}  // namespace base
+
+namespace offline_pages {
+
+class RequestCoordinator;
+
+// A factory to create one unique RequestCoordinator.
+class RequestCoordinatorFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static RequestCoordinatorFactory* GetInstance();
+  static RequestCoordinator* GetForBrowserContext(
+      content::BrowserContext* context);
+
+ private:
+  friend struct base::DefaultSingletonTraits<RequestCoordinatorFactory>;
+
+  RequestCoordinatorFactory();
+  ~RequestCoordinatorFactory() override {}
+
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(RequestCoordinatorFactory);
+};
+
+}  // namespace offline_pages
+
+#endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_REQUEST_COORDINATOR_FACTORY_H_