Fix visitor

```
external/libcxx/include/variant:587:19: error: static assertion failed due to requirement 'is_invocable_v<(anonymous namespace)::Visitor (lambda at external/libchrome-gestures/src/activity_replay.cc: `std::visit` requires the visitor to be exhaustive.
  587 |     static_assert(is_invocable_v<_Visitor, _Values...>,

```
Test:
source build/envsetup.sh
lunch aosp_x86_64-userdebug
cd master-plus-llvm/external/libchrome-gestures
mm

Bug: b/308807804

Change-Id: Ia0150688a6715370f3365ee790a8cba0b18ba38c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/gestures/+/4996084
Auto-Submit: Aditya Kumar <appujee@google.com>
Commit-Queue: Aditya Kumar <appujee@google.com>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>
Tested-by: Aditya Kumar <appujee@google.com>
1 file changed