Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  6b981c91afc83c6458866c45d39327e15346516f

Collect usage tracking info in ParserOutput.

During parsing, collect info about which entity is used how on which page,
and store that info in the ParserOutput, to be cached along with HTML output.

Bug: 64588
Change-Id: I0d342700c14f7566d7c1eefa80f482068bd8b362