Topsites become keyedService based.

chrome/browser/history/top_sites_service_factory.h

+// Copyright 2014 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_HISTORY_TOP_SITES_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_HISTORY_TOP_SITES_SERVICE_FACTORY_H_
+
+#include "base/memory/ref_counted.h"
+#include "chrome/browser/history/top_sites.h"
+#include "components/keyed_service/content/refcounted_browser_context_keyed_service_factory.h"
+
+template <typename T>
+struct DefaultSingletonTraits;
+
+// Used for creating and fetching a per-profile instance of the
+// TopSites.
+class TopSitesServiceFactory

[sdefresne, 2014/12/29 09:48:14]

nit: rename this class to TopSitesFactory

+    : public RefcountedBrowserContextKeyedServiceFactory {
+ public:
+  // Get the TopSites service for |profile|, creating one if needed.
+  static scoped_refptr<history::TopSites> GetForProfile(Profile* profile);
+
+  static scoped_refptr<history::TopSites> GetForProfileIfExists(
+      Profile* profile);
+
+  // Get the singleton instance of the factory.
+  static TopSitesServiceFactory* GetInstance();
+
+  // Creates and returns a TopSites Service for testing purposes.
+  static scoped_refptr<RefcountedKeyedService> BuildProfileForTesting(

[sdefresne, 2014/12/29 09:48:14]

I don't think those two method needs to be 1. method, 2. part of the public
interface. I would just make them free function in testing_profile.cc and remove
them from there.

[Jitu( very slow this week), 2014/12/30 10:09:03]

Done.

+      content::BrowserContext* profile);
+
+  static scoped_refptr<RefcountedKeyedService>
+  CreateCustomTopSitesServiceFactory(history::TopSites* top_sites);
+
+ protected:
+  // Overridden from BrowserContextKeyedServiceFactory.
+  scoped_refptr<RefcountedKeyedService> BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+ private:
+  friend struct DefaultSingletonTraits<TopSitesServiceFactory>;
+
+  TopSitesServiceFactory();
+  ~TopSitesServiceFactory() override;
+
+  DISALLOW_COPY_AND_ASSIGN(TopSitesServiceFactory);
+};
+
+#endif  // CHROME_BROWSER_HISTORY_TOP_SITES_SERVICE_FACTORY_H_