Toggle spoken feedback if two fingers are held down.

ui/chromeos/touch_exploration_controller.h

Index: ui/chromeos/touch_exploration_controller.h
diff --git a/ui/chromeos/touch_exploration_controller.h b/ui/chromeos/touch_exploration_controller.h
index 92de1eaad5effcfa825c485a0ea801794793be10..31d23d2f12e52d2a07c7cca30cc8d72c22477017 100644
--- a/ui/chromeos/touch_exploration_controller.h
+++ b/ui/chromeos/touch_exploration_controller.h
@@ -26,6 +26,7 @@ class Event;
 class EventHandler;
 class GestureEvent;
 class GestureProviderAura;
+class TouchAccessibilityEnabler;
 class TouchEvent;
 
 // A delegate to handle commands in response to detected accessibility gesture
@@ -181,7 +182,8 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
  public:
   explicit TouchExplorationController(
       aura::Window* root_window,
-      ui::TouchExplorationControllerDelegate* delegate);
+      ui::TouchExplorationControllerDelegate* delegate,
+      TouchAccessibilityEnabler* touch_accessibility_enabler);
   ~TouchExplorationController() override;
 
   // Make synthesized touch events are anchored at this point. This is
@@ -507,6 +509,12 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
   // LocatedEvents within this area should be left alone.
   gfx::Rect exclude_bounds_;
 
+  // Code that detects a touch-screen gesture to enable or disable
+  // accessibility. That handler is always running, whereas this is not,
+  // but events need to be sent to TouchAccessibilityEnabler before being
+  // rewritten when TouchExplorationController is running.
+  TouchAccessibilityEnabler* touch_accessibility_enabler_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchExplorationController);
 };