mus: Change PointerWatcher to watch for all events.

ui/events/gestures/motion_event_aura.cc

Index: ui/events/gestures/motion_event_aura.cc
diff --git a/ui/events/gestures/motion_event_aura.cc b/ui/events/gestures/motion_event_aura.cc
index 965f6a0a9948f0e15d9e3bdad68dba235e95aba8..3972689a5db9476b523373df837dab6c698fd99e 100644
--- a/ui/events/gestures/motion_event_aura.cc
+++ b/ui/events/gestures/motion_event_aura.cc
@@ -21,9 +21,9 @@ MotionEvent::ToolType EventPointerTypeToMotionEventToolType(
       return MotionEvent::TOOL_TYPE_STYLUS;
     case EventPointerType::POINTER_TYPE_TOUCH:
       return MotionEvent::TOOL_TYPE_FINGER;
+    default:
+      return MotionEvent::TOOL_TYPE_UNKNOWN;
   }
-
-  return MotionEvent::TOOL_TYPE_UNKNOWN;
 }
 
 PointerProperties GetPointerPropertiesFromTouchEvent(const TouchEvent& touch) {