Add a button to open TalkBack settings in chrome://settings.

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 2a8fbe3cb3360f3ac5592bd669a84afc62aa8e18..f5d6aecf407d4883b8f48b1a11ef32511a3f7f3b 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 +42,9 @@ bool LaunchAppWithRect(content::BrowserContext* context,
                        const std::string& app_id,
                        const gfx::Rect& target_rect);
 
+// Open TalkBack settings window.
+void ShowTalkBackSettings();
+
 // Tests if the application can use the given target resolution.
 // The callback will receive the information once known.
 // A false will get returned if the result cannot be determined in which case