app_list: Search result launch history and boost.

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

Index: chrome/browser/ui/app_list/search/history_data_observer.h
diff --git a/chrome/browser/ui/app_list/search/history_data_observer.h b/chrome/browser/ui/app_list/search/history_data_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..32f871d2ff2c51d054ae237b24e8d7b443b0a87b
--- /dev/null
+++ b/chrome/browser/ui/app_list/search/history_data_observer.h
@@ -0,0 +1,21 @@
+// 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_DATA_OBSERVER_H_
+#define CHROME_BROWSER_UI_APP_LIST_SEARCH_HISTORY_DATA_OBSERVER_H_
+
+namespace app_list {
+
+class HistoryDataObserver {
+ public:
+  // Invoked when the data is loaded from underlying store.
+  virtual void OnHistoryDataLoadedFromStore() = 0;
+
+ protected:
+  virtual ~HistoryDataObserver() {}
+};
+
+}  // namespace app_list
+
+#endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_HISTORY_DATA_OBSERVER_H_