Implement first version of OfflinePageSuggestionsProvider

chrome/browser/android/ntp/offline_page_suggestions_provider_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_NTP_OFFLINE_PAGE_SUGGESTIONS_PROVIDER_FACTORY_H_
+#define CHROME_BROWSER_ANDROID_NTP_OFFLINE_PAGE_SUGGESTIONS_PROVIDER_FACTORY_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+class Profile;
+
+namespace base {
+template <typename T>
+struct DefaultSingletonTraits;
+}  // namespace base
+
+namespace ntp_snippets {
+class ContentSuggestionsService;
+class OfflinePageSuggestionsProvider;
+}  // namespace ntp_snippets
+
+class OfflinePageSuggestionsProviderFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  static OfflinePageSuggestionsProviderFactory* GetInstance();
+  static ntp_snippets::OfflinePageSuggestionsProvider* GetForProfile(
+      Profile* profile);
+
+ private:
+  friend struct base::DefaultSingletonTraits<
+      OfflinePageSuggestionsProviderFactory>;
+
+  OfflinePageSuggestionsProviderFactory();
+  ~OfflinePageSuggestionsProviderFactory() override;
+
+  // BrowserContextKeyedServiceFactory implementation.
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(OfflinePageSuggestionsProviderFactory);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_NTP_OFFLINE_PAGE_SUGGESTIONS_PROVIDER_FACTORY_H_