Speed up ARC boot if the user launches ARC app while ARC is not ready

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

Index: chrome/browser/ui/app_list/arc/arc_app_utils.h
diff --git a/chrome/browser/ui/app_list/arc/arc_app_utils.h b/chrome/browser/ui/app_list/arc/arc_app_utils.h
index a42a3580f3836ff05acb2e871a9591a406dc758b..15aeb62689d3b1cb5a4aec3e8558689c9b9c36b9 100644
--- a/chrome/browser/ui/app_list/arc/arc_app_utils.h
+++ b/chrome/browser/ui/app_list/arc/arc_app_utils.h
@@ -76,6 +76,10 @@ bool ShowPackageInfo(const std::string& package_name);
 bool ShowPackageInfoOnPage(const std::string& package_name,
                            mojom::ShowPackageInfoPage page);
 
+// Prioritizes the ARC instance. See PrioritizeArcInstance() in
+// chromeos/dbus/session_manager_client.h for more details.
+void PrioritizeArcInstance();
+
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_ARC_ARC_APP_UTILS_H_