Fire accessibilityPrivate events on two-finger hold gesture.

ui/chromeos/touch_accessibility_enabler.cc

Index: ui/chromeos/touch_accessibility_enabler.cc
diff --git a/ui/chromeos/touch_accessibility_enabler.cc b/ui/chromeos/touch_accessibility_enabler.cc
index 004929ae3b571296da665c80203a6b4d85e95bb7..347e8de92f1204651fd4a45a6aada8031b53682f 100644
--- a/ui/chromeos/touch_accessibility_enabler.cc
+++ b/ui/chromeos/touch_accessibility_enabler.cc
@@ -109,6 +109,7 @@ void TouchAccessibilityEnabler::HandleTouchEvent(const ui::TouchEvent& event) {
     state_ = TWO_FINGERS_DOWN;
     two_finger_start_time_ = Now();
     StartTimer();
+    delegate_->OnTwoFingerTouchStart();
   }
 }
 
@@ -130,8 +131,10 @@ void TouchAccessibilityEnabler::StartTimer() {
 }
 
 void TouchAccessibilityEnabler::CancelTimer() {
-  if (timer_.IsRunning())
+  if (timer_.IsRunning()) {
     timer_.Stop();
+    delegate_->OnTwoFingerTouchStop();
+  }
 }
 
 void TouchAccessibilityEnabler::OnTimer() {