V2016.04.17
Go to Google Bookmarks: https://www.google.com/bookmarks/
On the bottom left, click "Export bookmarks": https://www.google.com/bookmarks/bookmarks.html?hl=en
Install script dependencies: pip3 install simplekml lxml
After downloading the html file, run this script on it to generate a KML file per bookmark label: python3 bookmarkstokml.py GoogleBookmarks.html
It's hacky and doesn't work on all of them, but it kinda works.