Download ADB Server for Chrome
Currently only works with Nexus 5. I'll whitelist other devices later and do a release on the Chrome web store.http://download.clockworkmod.com/test/chromeadb-server.zip
Enable developer mode.
Load unpacked extension.
I've forked ChromeADB and packaged my adb server with it, for a single package install. (original project: https://github.com/importre/chromeadb
Using adb already? adb kill-server from the command line if you want to test this.
On a Chromebook, the initial generation of the RSA key can take up to a minute. Be patient. Wait for the authorization dialog on your phone, then refresh the list of devices by clicking "ChromeADB".
I haven't implemented a lot of the various host service commands, but enough that it works. Including most adb commands via command line.
Still requires drivers on Windows.