Add the Play Store app search to the launcher.

chrome/browser/ui/app_list/search/search_controller_factory.cc

Index: chrome/browser/ui/app_list/search/search_controller_factory.cc
diff --git a/chrome/browser/ui/app_list/search/search_controller_factory.cc b/chrome/browser/ui/app_list/search/search_controller_factory.cc
index b0d21a3b1c2e7e45f901b98c894530bc6b369cf2..417d6890523e498d4c23cb4236dc795980abbe46 100644
--- a/chrome/browser/ui/app_list/search/search_controller_factory.cc
+++ b/chrome/browser/ui/app_list/search/search_controller_factory.cc
@@ -16,6 +16,7 @@
 #include "chrome/browser/ui/app_list/search/answer_card/answer_card_search_provider.h"
 #include "chrome/browser/ui/app_list/search/answer_card/answer_card_web_contents.h"
 #include "chrome/browser/ui/app_list/search/app_search_provider.h"
+#include "chrome/browser/ui/app_list/search/arc/arc_playstore_search_provider.h"
 #include "chrome/browser/ui/app_list/search/history_factory.h"
 #include "chrome/browser/ui/app_list/search/launcher_search/launcher_search_provider.h"
 #include "chrome/browser/ui/app_list/search/omnibox_provider.h"
@@ -35,6 +36,7 @@ namespace {
 // Maximum number of results to show in each mixer group.
 constexpr size_t kMaxAppsGroupResults = 8;
 constexpr size_t kMaxOmniboxResults = 4;
+constexpr size_t kMaxPlayStoreResults = 2;
 constexpr size_t kMaxWebstoreResults = 2;
 constexpr size_t kMaxSuggestionsResults = 6;
 constexpr size_t kMaxLauncherSearchResults = 2;
@@ -113,6 +115,13 @@ std::unique_ptr<SearchController> CreateSearchController(
                             base::MakeUnique<LauncherSearchProvider>(profile));
   }
 
+#if defined(OS_CHROMEOS)

[xiyuan, 2017/06/23 19:57:39]

Is this necessary? If it is, we need to put header under it too.

[Jiaquan He, 2017/06/23 21:10:32]

Done.

+  size_t playstore_api_group_id =
+      controller->AddGroup(kMaxPlayStoreResults, 1.0);
+  controller->AddProvider(playstore_api_group_id,
+                          base::MakeUnique<ArcPlayStoreSearchProvider>(
+                              kMaxPlayStoreResults, profile, list_controller));
+#endif
   return controller;
 }