Add the Play Store app search to the launcher.

chrome/browser/ui/app_list/search/playstore/playstore_search_provider.h

+// Copyright 2017 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_PLAYSTORE_PLAYSTORE_SEARCH_PROVIDER_H_
+#define CHROME_BROWSER_UI_APP_LIST_SEARCH_PLAYSTORE_PLAYSTORE_SEARCH_PROVIDER_H_
+
+#include "components/arc/common/app.mojom.h"
+#include "ui/app_list/search_provider.h"
+
+class Profile;
+class AppListControllerDelegate;
+
+namespace app_list {
+
+class PlayStoreSearchProvider : public SearchProvider {
+ public:
+  // app_list::SearchProvider overrides;

[Luis Héctor Chávez, 2017/06/22 15:42:09]

Move this to after L24.

[Jiaquan He, 2017/06/22 19:12:41]

Done.

+  PlayStoreSearchProvider(int max_results,
+                          Profile* profile,
+                          AppListControllerDelegate* list_controller);
+  ~PlayStoreSearchProvider() override;
+
+ protected:
+  void Start(bool is_voice_query, const base::string16& query) override;
+  void Stop() override;
+
+ private:
+  void OnResults(std::vector<PlayStoreSearchResultUniquePtr> results);

[Luis Héctor Chávez, 2017/06/22 15:42:09]

Newline below the methods.

[Jiaquan He, 2017/06/22 19:12:41]

Done.

+  const int max_results_;
+  Profile* profile_;

[Luis Héctor Chávez, 2017/06/22 15:42:10]

Profile* const profile_;

Also, comment about its lifetime.

[Jiaquan He, 2017/06/22 19:12:41]

Done.

+  // list_controller_ is owned by AppListServiceAsh and lives
+  // until the service finishes.
+  AppListControllerDelegate* list_controller_;

[Luis Héctor Chávez, 2017/06/22 15:42:09]

const

[Jiaquan He, 2017/06/22 19:12:41]

Done.

+  base::WeakPtrFactory<PlayStoreSearchProvider> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PlayStoreSearchProvider);
+};
+
+}  // namespace app_list
+
+#endif  // CHROME_BROWSER_UI_APP_LIST_SEARCH_PLAYSTORE_PLAYSTORE_SEARCH_PROVIDER_H_