Toggle spoken feedback if two fingers are held down.

ash/ash_touch_exploration_manager_chromeos.cc

Index: ash/ash_touch_exploration_manager_chromeos.cc
diff --git a/ash/ash_touch_exploration_manager_chromeos.cc b/ash/ash_touch_exploration_manager_chromeos.cc
index 8eda21eebdac5d43bafa95e6e7d0744f40322b6b..4919f9332a35c875be5d2e30b97a0ea9fc3133fc 100644
--- a/ash/ash_touch_exploration_manager_chromeos.cc
+++ b/ash/ash_touch_exploration_manager_chromeos.cc
@@ -102,6 +102,17 @@ void AshTouchExplorationManager::OnDisplayMetricsChanged(
     UpdateTouchExplorationState();
 }
 
+void AshTouchExplorationManager::PlaySpokenFeedbackToggleCountdown(
+    int tick_count) {
+  WmShell::Get()->accessibility_delegate()->PlaySpokenFeedbackToggleCountdown(
+      tick_count);
+}
+
+void AshTouchExplorationManager::ToggleSpokenFeedback() {
+  WmShell::Get()->accessibility_delegate()->ToggleSpokenFeedback(
+      ash::A11Y_NOTIFICATION_SHOW);
+}
+
 void AshTouchExplorationManager::OnWindowActivated(
     aura::client::ActivationChangeObserver::ActivationReason reason,
     aura::Window* gained_active,
@@ -150,6 +161,12 @@ void AshTouchExplorationManager::UpdateTouchExplorationState() {
   } else {
     touch_exploration_controller_.reset();
   }
+
+  if (!touch_accessibility_enabler_) {
+    // Always enable gesture to toggle spoken feedback.
+    touch_accessibility_enabler_.reset(new ui::TouchAccessibilityEnabler(
+        root_window_controller_->GetRootWindow(), this));
+  }
 }
 
 bool AshTouchExplorationManager::VolumeAdjustSoundEnabled() {