Daseul Lee

Per discussions from https://github.com/whatwg/fs/issues/7 and https://github.com/whatwg/fs/issues/28, this PR updates FileSystemSyncAccessHandle getSize(), truncate(), flush() and close() asynchronous methods to synchronous. - [x] At least two implementers are interested (and none opposed):...

Using F_FULLFSYNC for flush() causing slow performance on Mac

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### What is the issue with the File System Standard? Chromium uses F_FULLFSYNC for handle.flush() on Mac, for which we have received feedback on noticeably slow performance, compared to other...