This patch introduces a cookie cache in the WebContent process to reduce
blocking IPC calls when JS accesses document.cookie. The UI process now
maintains a cookie version counter per-domain in shared memory. When JS
reads document.cookie, we check whether we have a valid cached cookie by
comparing the current shared version to the last used version. If they
match, the cached cookie is returned without IPC.
This optimization is based on Chromium's shared versioning, in which it
was observed that 87% of document.cookie accesses were redundant. See:
https://blog.chromium.org/2024/06/introducing-shared-memory-versioning-to.html
Note that this cache only supports document.cookie, not HTTP Cookie
headers. HTTP cookies are attached to requests with varying URLs and
paths. The cookies that match the document URL might not match the
request URL, which we wouldn't know from WebContent. So attaching the
cached document cookie would be incorrect.
On https://twinings.co.uk, we see approximately 600 document.cookie
requests while the page loads. This patch reduces the time spent in
the document.cookie getter from ~45ms to 2-3ms.
This commit provides IPC endpoint to WebWorker processes that allows new
WebWorker processes to be requested (just like what WebContent has).
This is implemented by proxying the request_worker_agent call from
WebWorker through WebContent to LibWebView. This allows the WPT test...
http://wpt.live/referrer-policy/gen/worker-classic.http-rp/unsafe-url/worker-classic.http.html
...to pass, and the same is likely true for similar tests.
Allows formulas to update on Google Sheets, which uses a Worker to
update them and makes cookie authenticated requests, which was failing
before this commit.
This has the limitation that it has to proxy through the WebContent
process, but that's how the current infrastructure is, which is outside
the scope of this commit.
Instead of wrapping all non-movable members of TransportSocket in OwnPtr
to keep it movable, make TransportSocket itself non-movable and wrap it
in OwnPtr.
