arc-app-launcher: Minimal support for ARC app launcher.

chrome/browser/ui/app_list/app_list_syncable_service_factory.cc

Index: chrome/browser/ui/app_list/app_list_syncable_service_factory.cc
diff --git a/chrome/browser/ui/app_list/app_list_syncable_service_factory.cc b/chrome/browser/ui/app_list/app_list_syncable_service_factory.cc
index 2c96dc229a0755c8c9bb22eab841287b1b8e069a..1cf4a243ed8ea316909261a2d4f4ae01a9bb4c2b 100644
--- a/chrome/browser/ui/app_list/app_list_syncable_service_factory.cc
+++ b/chrome/browser/ui/app_list/app_list_syncable_service_factory.cc
@@ -20,6 +20,10 @@
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #endif
 
+#if defined(ENABLE_ARC)
+#include "chrome/browser/ui/app_list/arc/arc_app_list_prefs_factory.h"
+#endif
+
 namespace app_list {
 
 // static
@@ -57,6 +61,9 @@ AppListSyncableServiceFactory::AppListSyncableServiceFactory()
   FactorySet dependent_factories;
   dependent_factories.insert(
       extensions::ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
+#if defined(ENABLE_ARC)
+  dependent_factories.insert(ArcAppListPrefsFactory::GetInstance());
+#endif
   DriveAppProvider::AppendDependsOnFactories(&dependent_factories);
   for (FactorySet::iterator it = dependent_factories.begin();
        it != dependent_factories.end();