Android : How to make Toolbar animation like the Contacts app in Lollipop

I am working on this app and I would like to implement the collapsing animation similar to the contacts app, I have not been able to find a tutorial that works with the Toolbar in the support library.

Here is a video showing the animation: http://material-design.storage.googleapis.com/publish/v_2/material_ext_publish/0B0NGgBg38lWWZ1F2b1pUOGFiZHc/patterns-scrollingtech-scrolling-070801_Flexible_Space_with_Image_xhdpi_002.webm