Set the correct pressure for pointer events based on force

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index dd3ce7fd6bd33344f1fd0f1bedb3526b96cf7011..781b0ef6666e941fab2f6836c741eb9d1555f626 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -331,7 +331,8 @@ class EVENTS_EXPORT PointerDetails {
  public:
   PointerDetails() {}
   explicit PointerDetails(EventPointerType pointer_type)
-      : pointer_type_(pointer_type) {}
+      : pointer_type_(pointer_type),
+        force_(std::numeric_limits<float>::quiet_NaN()) {}
   PointerDetails(EventPointerType pointer_type,
                  float radius_x,
                  float radius_y,