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

ash/shell.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/shell.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/accelerators/accelerator_filter.h"
 #include "ash/accelerators/focus_manager_factory.h"
 #include "ash/accelerators/nested_dispatcher_controller.h"
+#include "ash/accelerators/spoken_feedback_toggler.h"
 #include "ash/ash_switches.h"
 #include "ash/autoclick/autoclick_controller.h"
 #include "ash/caps_lock_delegate.h"
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "ash/desktop_background/desktop_background_view.h"
 #include "ash/desktop_background/user_wallpaper_delegate.h"
 #include "ash/display/cursor_window_controller.h"
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/event_transformation_handler.h"
@@ skipping 589 matching lines @@
 
   // Remove the focus from any window. This will prevent overhead and side
   // effects (e.g. crashes) from changing focus during shutdown.
   // See bug crbug.com/134502.
   aura::client::GetFocusClient(GetPrimaryRootWindow())->FocusWindow(NULL);
 
   // Please keep in same order as in Init() because it's easy to miss one.
   if (window_modality_controller_)
     window_modality_controller_.reset();
 #if defined(OS_CHROMEOS) && defined(USE_X11)
-  RemovePreTargetHandler(magnifier_key_scroller_.get());
-  magnifier_key_scroller_.reset();
+  RemovePreTargetHandler(magnifier_key_scroll_handler_.get());
+  magnifier_key_scroll_handler_.reset();
+
+  RemovePreTargetHandler(speech_feedback_handler_.get());
+  speech_feedback_handler_.reset();
 #endif
   RemovePreTargetHandler(event_rewriter_filter_.get());
   RemovePreTargetHandler(user_activity_detector_.get());
   RemovePreTargetHandler(overlay_filter_.get());
   RemovePreTargetHandler(input_method_filter_.get());
   RemovePreTargetHandler(accelerator_filter_.get());
   RemovePreTargetHandler(event_transformation_handler_.get());
   RemovePreTargetHandler(toplevel_window_event_handler_.get());
   RemovePostTargetHandler(toplevel_window_event_handler_.get());
   RemovePreTargetHandler(system_gesture_filter_.get());
@@ skipping 187 matching lines @@
   resolution_notification_controller_.reset(
       new internal::ResolutionNotificationController);
 #endif
 
   cursor_manager_.SetDisplay(GetScreen()->GetPrimaryDisplay());
 
   nested_dispatcher_controller_.reset(new NestedDispatcherController);
   accelerator_controller_.reset(new AcceleratorController);
 
 #if defined(OS_CHROMEOS) && defined(USE_X11)
-  magnifier_key_scroller_.reset(new MagnifierKeyScroller);
-  AddPreTargetHandler(magnifier_key_scroller_.get());
+  magnifier_key_scroll_handler_.reset(MagnifierKeyScroller::CreateHandler());
+  AddPreTargetHandler(magnifier_key_scroll_handler_.get());
+  speech_feedback_handler_.reset(SpokenFeedbackToggler::CreateHandler());
+  AddPreTargetHandler(speech_feedback_handler_.get());
 #endif
 
   // The order in which event filters are added is significant.
   event_rewriter_filter_.reset(new internal::EventRewriterEventFilter);
   AddPreTargetHandler(event_rewriter_filter_.get());
 
 #if defined(OS_CHROMEOS)
   // The StickyKeysController also rewrites events and must be added
   // before observers, but after the EventRewriterEventFilter.
   sticky_keys_controller_.reset(new StickyKeysController);
@@ skipping 232 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, aura::client::ActivationChangeObserver implementation:
 
 void Shell::OnWindowActivated(aura::Window* gained_active,
                               aura::Window* lost_active) {
   if (gained_active)
     target_root_window_ = gained_active->GetRootWindow();
 }
 
 }  // namespace ash