Keep a reference of leaflet layer objects created in the code, for internal/developer use.
Keep a reference of leaflet layer objects created
in the code, for internal/developer use.

Bug: T134202
Change-Id: I0201df4f427ecc18d066336ee221054daa2f7153

wikimedia/mediawiki-extensions-Kartographer,wikimedia/mediawiki-extensions-Kartographer,wikimedia/mediawiki-extensions-Kartographer