Change Observer: Add WPTs for FileSystemHandle creation and deletion
Adds expectations to the WPTs for creation and deletion. Tests that
they emit the correct event and only emit an event while in scope.
Bug: 341136316
Change-Id: I295662e6c631a31c2914e0117e7aaca8d208d3b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5744535
Commit-Queue: Nathan Memmott memmott@chromium.org
Reviewed-by: Daseul Lee dslee@chromium.org
Cr-Commit-Position: refs/heads/main@{#1335506}