Long press menu (shift+f6) to toggle spoken feedback.

chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc

Index: chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc b/chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc
index ab915283658153a6c9148f92d7f21f2695982456..64e0cbd3541adf01954c4bc7767714bc58673e5f 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc
+++ b/chrome/browser/ui/ash/chrome_shell_delegate_chromeos.cc
@@ -4,8 +4,9 @@
 
 #include "chrome/browser/ui/ash/chrome_shell_delegate.h"
 
+#include "ash/accelerators/magnifier_key_scroller.h"
+#include "ash/accelerators/spoken_feedback_toggler.h"
 #include "ash/accessibility_delegate.h"
-#include "ash/magnifier/magnifier_key_scroller.h"
 #include "ash/media_delegate.h"
 #include "ash/wm/mru_window_tracker.h"
 #include "ash/wm/window_util.h"
@@ -54,9 +55,13 @@ void InitAfterSessionStart() {
   if (!mru_list.empty())
     mru_list.front()->Focus();
 
-  // Enable magnifier accelerators as there may be no mouse cursor in
+  // Enable magnifier scroll keys as there may be no mouse cursor in
   // kiosk mode.
   ash::MagnifierKeyScroller::SetEnabled(chrome::IsRunningInForcedAppMode());
+
+  // Enable long press action to toggle spoken feedback with hotrod
+  // remote which can't handle shortcut.
+  ash::SpokenFeedbackToggler::SetEnabled(chrome::IsRunningInForcedAppMode());
 }
 
 class AccessibilityDelegateImpl : public ash::AccessibilityDelegate {