Visual Editor currently requests MediaWiki DOM version 2.0.0
when talking to Parsoid. Since Parsoid treats that as a request
for 2.4.0, its current version, and Parsoid doesn't have a
2.4.0->2.0.0 downgrade path, passing the latest Parsoid version
(2.4.0) should make no difference in practice -- but would better
match current reality.
Change-Id: Ia2bc0c1981db6f573a69fb1910cef4304c80ae00
Now that Parsoid's ServiceWorkers have been merged to core, this adds
support for "zero configuration Visual Editor" to the master branch.
Like earlier zero-conf work, this does not use RESTBase for stashing
or for reliable selective serialization. Future integration work
with ParserCache will reintroduce this functionality. Nevertheless,
this implementation should have feature parity with the "loopback interface"
zero conf VE we've been shipping since 1.35.
Bug: T305108
Change-Id: I7b5b4a6d16b07914f947cbaf498ad1d3cf2447a5