Add the Play Store app search to the launcher.

chrome/browser/ui/app_list/search/arc/arc_playstore_search_provider.cc

+// 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.
+
+#include "chrome/browser/ui/app_list/search/arc/arc_playstore_search_provider.h"
+
+#include <utility>
+
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/ui/app_list/arc/arc_app_list_prefs.h"
+#include "chrome/browser/ui/app_list/search/arc/arc_playstore_search_result.h"
+#include "components/arc/arc_bridge_service.h"
+#include "components/arc/arc_service_manager.h"
+
+namespace app_list {
+
+ArcPlayStoreSearchProvider::ArcPlayStoreSearchProvider(
+    int max_results,
+    Profile* profile,
+    AppListControllerDelegate* list_controller)
+    : max_results_(max_results),
+      profile_(profile),
+      list_controller_(list_controller),
+      weak_ptr_factory_(this) {}
+
+ArcPlayStoreSearchProvider::~ArcPlayStoreSearchProvider() = default;
+
+void ArcPlayStoreSearchProvider::Start(bool is_voice_query,
+                                       const base::string16& query) {
+  // TODO(crbug.com/736027): should search for voice?
+  arc::mojom::AppInstance* app_instance =
+      arc::ArcServiceManager::Get()
+          ? ARC_GET_INSTANCE_FOR_METHOD(
+                arc::ArcServiceManager::Get()->arc_bridge_service()->app(),
+                GetRecentAndSuggestedAppsFromPlayStore)
+          : nullptr;
+
+  if (app_instance == nullptr)
+    return;
+
+  ClearResults();
+  app_instance->GetRecentAndSuggestedAppsFromPlayStore(
+      UTF16ToUTF8(query), max_results_,
+      base::Bind(&ArcPlayStoreSearchProvider::OnResults,
+                 weak_ptr_factory_.GetWeakPtr()));
+}
+
+void ArcPlayStoreSearchProvider::Stop() {}
+
+void ArcPlayStoreSearchProvider::OnResults(
+    std::vector<arc::mojom::AppDiscoveryResultPtr> results) {
+  for (auto& result : results) {
+    Add(base::MakeUnique<ArcPlayStoreSearchResult>(std::move(result), profile_,

[dcheng, 2017/06/24 00:16:47]

Is it a problem if results.size() > max_results_?

[Jiaquan He, 2017/06/24 00:48:08]

The Play Store service guarantees that the amount of returned results won't
exceed max_results_.

If it somehow fails to do this, which should never happen, these results will be
sent to a mixer to mixed with other types of results, and it will again make
sure results of this type won't be more than max_results_.

[dcheng, 2017/06/24 00:58:28]

Right, but we don't trust the ARC++ process as much. So it could return more
than max items.

As long as it's handled correctly, I'm OK with that.

+                                                   list_controller_));
+  }
+}
+
+}  // namespace app_list