arc: Support window recreation.

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 f5d6aecf407d4883b8f48b1a11ef32511a3f7f3b..04a293100446de0fe5724415ab31f142f829f286 100644
--- a/chrome/browser/ui/app_list/arc/arc_app_utils.h
+++ b/chrome/browser/ui/app_list/arc/arc_app_utils.h
@@ -42,6 +42,12 @@ bool LaunchAppWithRect(content::BrowserContext* context,
                        const std::string& app_id,
                        const gfx::Rect& target_rect);
 
+// Sets task active.
+void SetTaskActive(int task_id);
+
+// Closes the task.
+void CloseTask(int task_id);
+
 // Open TalkBack settings window.
 void ShowTalkBackSettings();