I'm surprised that I can't find anything about this here, but it's a well known issue that Google Earth VR has ceased to work on new AMD drivers and has last worked with 18.5.1.
Blackscreen on Vive :: Google Earth VR General Discussions
Google Earth VR not working on Vive anymore | Overclockers UK Forums
AMD Releases Radeon Software Adrenalin Edition 18.9.2 Graphics Drivers | TechPowerUp (comments)
I've tried the newest 18.11.1 and still same issue.