Add UMA metrics to measure the effectiveness of views fuzzing

ash/wm/system_gesture_event_filter.cc

Index: ash/wm/system_gesture_event_filter.cc
diff --git a/ash/wm/system_gesture_event_filter.cc b/ash/wm/system_gesture_event_filter.cc
index 029ab720f4e6e1a064ae81b77d43d17b5968a00d..134e423b417a897700661f4e2a2ba71532d85559 100644
--- a/ash/wm/system_gesture_event_filter.cc
+++ b/ash/wm/system_gesture_event_filter.cc
@@ -65,13 +65,13 @@ void SystemGestureEventFilter::OnMouseEvent(ui::MouseEvent* event) {
 
 void SystemGestureEventFilter::OnTouchEvent(ui::TouchEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
-  touch_uma_.RecordTouchEvent(target, *event);
+  TouchUMA::GetInstance()->RecordTouchEvent(target, *event);
   long_press_affordance_->ProcessEvent(target, event, event->touch_id());
 }
 
 void SystemGestureEventFilter::OnGestureEvent(ui::GestureEvent* event) {
   aura::Window* target = static_cast<aura::Window*>(event->target());
-  touch_uma_.RecordGestureEvent(target, *event);
+  TouchUMA::GetInstance()->RecordGestureEvent(target, *event);
   long_press_affordance_->ProcessEvent(target, event,
       event->GetLowestTouchId());