Adding an IO Data and keyed service to previews/

chrome/browser/previews/previews_service_factory.h

Index: chrome/browser/previews/previews_service_factory.h
diff --git a/chrome/browser/previews/previews_service_factory.h b/chrome/browser/previews/previews_service_factory.h
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+// 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_PREVIEWS_PREVIEWS_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_PREVIEWS_PREVIEWS_SERVICE_FACTORY_H_
+
+#include "base/lazy_instance.h"
+#include "base/macros.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace content {
+class BrowserContext;
+}
+
+class PreviewsService;
+class Profile;
+
+// LazyInstance that owns all PreviewsServices and associates them with
+// Profiles.
+class PreviewsServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  // Gets the PreviewsService instance for |profile|.
+  static PreviewsService* GetForProfile(Profile* profile);
+
+  // Gets the LazyInstance that owns all PreviewsServices.
+  static PreviewsServiceFactory* GetInstance();
+
+ private:
+  friend struct base::DefaultLazyInstanceTraits<PreviewsServiceFactory>;
+
+  PreviewsServiceFactory();
+  ~PreviewsServiceFactory() override;
+
+  // BrowserContextKeyedServiceFactory:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(PreviewsServiceFactory);
+};
+
+#endif  // CHROME_BROWSER_PREVIEWS_PREVIEWS_SERVICE_FACTORY_H_