Finding Wikimedia code repos hosted on Gitiles can be extremely annoying. Because it doesn't appear that they are indexed by search engines, looking them up returns only their Gerrit changes websites. For example, in order to get to the Mediawiki core Gitiles repo, I search for it , I have to click on the https://gerrit.wikimedia.org/r result because it's the only one, then I have to click "VIEW CHANGES", and then I finally get the "Browse: gitiles" link.
I've faced even more steps when trying to find repos that have very few changes, are small, and are submodules of another repo. For example, it took quite awhile to try the find the value-view Wikibase repo. A Google search doesn't even yield a link to its Gerrit changes site. I did end up finding a link to its JS documentation, however I have no idea how to get from that to Gitiles. I only ended up finding it by looking up a changes that had "value-view" in them on Gerrit, clicking on one, clicking on its repo, and then clicking on Browse: gitiles.
It shouldn't take me this many steps. Gitiles repos should show up in search results in search engines.