arc: Make Play Store item persistance in shelf.

chrome/browser/ui/ash/chrome_launcher_prefs.cc

 // Copyright (c) 2012 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/ash/chrome_launcher_prefs.h"
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
+#include "chrome/browser/chromeos/arc/arc_support_host.h"
 #include "chrome/browser/ui/ash/launcher/launcher_controller_helper.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/pref_names.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/scoped_user_pref_update.h"
 #include "ui/display/screen.h"
 
 namespace ash {
 
@@ skipping 293 matching lines @@
         dictionary->GetString(kPinnedAppsPrefAppIDPath, &app_id) &&
         helper->IsValidIDForCurrentUser(app_id) &&
         std::find(apps.begin(), apps.end(), app_id) == apps.end() &&
         (!dictionary->GetBoolean(kPinnedAppsPrefPinnedByPolicy,
                                  &pinned_by_policy) ||
          !pinned_by_policy)) {
       apps.push_back(app_id);
     }
   }
 
+  apps.push_back(ArcSupportHost::kHostAppId);
+
   // If not added yet, the chrome item will be the last item in the list.
   if (!chrome_listed)
     apps.push_back(extension_misc::kChromeAppId);
 
   // If not added yet, place the app list item at the beginning of the list.
   if (std::find(apps.begin(), apps.end(), kPinnedAppsPlaceholder) == apps.end())
     apps.insert(apps.begin(), kPinnedAppsPlaceholder);
 
   return apps;
 }
 
 }  // namespace ash