If you use an external monitor with your Chromebook, here is a keyboard shortcut to help you move windows between two monitors easily.
Update: The new keyboard shortcut to quickly move windows or apps from one screen to another is:
SEARCH + ALT + M
Here is Google’s Happiness Evangelist François Beaufort giving you a video demo of this new feature. It looks quite smooth in the video. François is using a Chromebook pixel, with an Acer display connected to it using USB Type C cable:
If you are a Chromebook user with one or more external displays connected, this is something that you should try out when you get the next Chrome OS update. This is currently available in the Canary channel of Chrome OS. It will take a few weeks for it to graduate into the Stable channel.