[DirectSockets] Add self-contained WPTs for the Direct Sockets API
Bug: 338475101
Change-Id: I4441e18da6590937dad8edd4933d7ba46e08c10c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5513762
Commit-Queue: Andrew Rayskiy greengrape@google.com
Reviewed-by: Weizhong Xia weizhong@google.com
Cr-Commit-Position: refs/heads/main@{#1296893}