Give ConduitAPIMethod->getMethodDescription() access to a real Viewer
Ref T9964. The new *.search and *.edit methods generate documentation which depends on the viewer.
For example, the *.search methods show a reference table of the keys for all your saved queries.
Give them a real viewer to work with.
During normal execution, just populate this viewer with the request's viewer, so $request->getViewer() and $this->getViewer() both work and mean the same thing.
Reviewed By: chad
Maniphest Tasks: T9964
Differential Revision: https://secure.phabricator.com/D14761