arc: Add support of default and OEM apps.

chrome/browser/ui/app_list/arc/arc_app_utils.cc

Index: chrome/browser/ui/app_list/arc/arc_app_utils.cc
diff --git a/chrome/browser/ui/app_list/arc/arc_app_utils.cc b/chrome/browser/ui/app_list/arc/arc_app_utils.cc
index 94e69c14130ea9285aa349d6eb9bf228ebebce1b..c1606d3939018a66e97fa588bfdfd3b275c44f11 100644
--- a/chrome/browser/ui/app_list/arc/arc_app_utils.cc
+++ b/chrome/browser/ui/app_list/arc/arc_app_utils.cc
@@ -222,6 +222,22 @@ bool LaunchApp(content::BrowserContext* context,
     if (!ash::Shell::HasInstance())
       return false;
 
+    ArcAuthService* auth_service = ArcAuthService::Get();
+    DCHECK(auth_service);
+
+    if (!auth_service->IsArcEnabled()) {
+      if (!prefs->IsDefault(app_id)) {
+        NOTREACHED();
+        return false;
+      }
+
+      auth_service->EnableArc();
+      if (!auth_service->IsArcEnabled()) {
+        NOTREACHED();
+        return false;
+      }
+    }
+
     ChromeLauncherController* chrome_controller =
         ChromeLauncherController::instance();
     DCHECK(chrome_controller);