app_list: Search result launch history and boost.

chrome/browser/ui/app_list/search/history_factory.h

Index: chrome/browser/ui/app_list/search/history_factory.h
diff --git a/chrome/browser/ui/app_list/search/history_factory.h b/chrome/browser/ui/app_list/search/history_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..c09fa728917c168008aece37b7a324dc624eff7d
--- /dev/null
+++ b/chrome/browser/ui/app_list/search/history_factory.h
@@ -0,0 +1,43 @@
+// Copyright 2013 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_UI_APP_LIST_SEARCH_HISTORY_FACTORY_H_
+#define CHROME_BROWSER_UI_APP_LIST_SEARCH_HISTORY_FACTORY_H_
+
+#include "base/memory/singleton.h"

[tfarina, 2013/05/23 22:56:25]

could you forward declare this instead?

template <typename T> struct DefaultSingletonTraits;

[xiyuan, 2013/05/24 16:33:02]

Done.

+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace app_list {
+
+class History;
+
+// Singleton that owns all History and associates them with profiles;
+class HistoryFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  // Returns singleton instance of HistoryFactory.
+  static HistoryFactory* GetInstance();
+
+  // Returns History associated with |context|.
+  static History* GetForBrowserContext(content::BrowserContext* context);
+
+ private:
+  friend struct DefaultSingletonTraits<HistoryFactory>;
+
+  HistoryFactory();
+  virtual ~HistoryFactory();
+
+  // BrowserContextKeyedServiceFactory overrides:
+  virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(HistoryFactory);
+};
+
+}  // namespace app_list
+
+#endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_HISTORY_FACTORY_H_