I use a Chromebook as a daily-carry laptop, and occasionally have to give presentations (which I create using LaTeX/beamer). I've so far been unable to find a presentation mode PDF viewer that runs under Chrome OS. Though there are a few PDF viewers listed in the chrome app store.
I'm able to run Android apps on there, but the absence of an accelerometer/orientation sensor means some PDF viewers (e.g. Adobe) run in a little portrait window. Chrome's own PDF display doesn't do a real presentation mode: even with a fullscreen window and "fit to page" display I get a scrollbar, a large grey border on 3 to 4 sides and (depending on the order I select the options) sometimes the top of the next slide. Pressing up or down arrow scrolls continuously too, and you can't use a mouse to advance slides.
My current solution is to run Debian using crouton (which is how I work on the machine). Then I can run Evince. But connecting an external monitor doesn't work once the X server for Debian is running. So I have to plug in the monitor, wait for it to be recognised, and then start XFCE.