Google recently released the ability to create a tour directly in Google Earth's Chrome version. You can start a new project by selecting the project icon (2nd option from the bottom). You will also see all your previous files as well. One additional way to start a project is to type in a location and then add then select Add to project from the card.
You can then start your project. A helpful tutorial video is at the bottom of the screen as well.
What is nice are the options you see below:
Embedded below is a 3 minute and 35 second YouTube tutorial.