Until now, reviewer suggestion was purely based on a search. I've built
a small recommender to improve the suggestions based on past
contributions by the individual reviewers and added an extension point
so that people can customize this feature.
The built-in recommender makes a default suggestion of reviewers before
the user types a query. These are based on people that have reviewed the
last contributions that a user made.
If the user starts typing in the box, we generate a list of candidates
using the account index and feed it into a small recommender. The
recommender ranks the list by looking at recent contributions of the
candidates made in the same project. Contributions include reviews,
owned-changes and comments at different weights.
Change-Id: I5aca23ddd2442146fd26bdc12e7c18da85de7ac1
87880b0543