Add persistent filesystem type support to incognito.
Blocking 'Persistent' filesystem type in incognito mode had resulted in a backdoor to detect users being incognito. Since all stored data in incognito mode are ephemeral and they only last until the session is open, we can enable persistent filesystem type in incognito mode as well and treat it similar to a temporary one (which is in-memory). This feature is still DISABLED by default, behind "EnablePersistentFilesystemInIncognito" flag. third_party/blink/tools/run_blink_wptserve.py out/Default/chrome --incognito --enable-features="EnablePersistentFilesystemInIncognito" http://localhost:8001/wpt_internal/file-system-api/temporary_vs_persistent.window.html Bug: 990592 Change-Id: Ie49bc204f500c8f07e265adb0a5fe46371862d1e Tested: Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1875252 Commit-Queue: Ramin Halavati <rhalavati@chromium.org> Reviewed-by:Victor Costan <pwnall@chromium.org> Cr-Commit-Position: refs/heads/master@{#712963}
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