Fire accessibilityPrivate events on two-finger hold gesture.

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 11fb5b75c53182dd4d8026206a888939d75c214e..c9ed8ac41cc1bfc801928343b082113e9702c0ca 100644
--- a/ash/ash_touch_exploration_manager_chromeos.cc
+++ b/ash/ash_touch_exploration_manager_chromeos.cc
@@ -104,6 +104,16 @@ void AshTouchExplorationManager::OnDisplayMetricsChanged(
     UpdateTouchExplorationState();
 }
 
+void AshTouchExplorationManager::OnTwoFingerTouchStart() {
+  AccessibilityDelegate* delegate = Shell::Get()->accessibility_delegate();
+  delegate->OnTwoFingerTouchStart();
+}
+
+void AshTouchExplorationManager::OnTwoFingerTouchStop() {
+  AccessibilityDelegate* delegate = Shell::Get()->accessibility_delegate();
+  delegate->OnTwoFingerTouchStart();
+}
+
 void AshTouchExplorationManager::PlaySpokenFeedbackToggleCountdown(
     int tick_count) {
   AccessibilityDelegate* delegate = Shell::Get()->accessibility_delegate();