Propagates the search result of start page to the app-list search box.

chrome/browser/ui/app_list/start_page_observer.h

+// 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_START_PAGE_OBSERVER_H_
+#define CHROME_BROWSER_UI_APP_LIST_START_PAGE_OBSERVER_H_
+
+#include "base/strings/string16.h"
+
+namespace app_list {
+
+class StartPageObserver {
+ public:
+  // Invoked when a search query happens from the start page.
+  virtual void OnSearch(const base::string16& query) = 0;
+
+ protected:
+  virtual ~StartPageObserver() {}
+};
+
+}  // namespace app_list
+
+#endif  // CHROME_BROWSER_UI_APP_LIST_START_PAGE_OBSERVER_H_