UserAgent: Mozilla/5.0 (X11; CrOS x86_64 10895.78.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.120 Safari/537.36
Platform: 10895.78.0 (Official Build) stable-channel soraka-unibuild (soraka)

Steps to reproduce the problem:
1. Open android app (eg Photos) in full screen mode
2. Double click the title bar to switch to non-full screen/windowed mode
3. 

What is the expected behavior?
App switches to windowed mode, say, in the middle of one of the screens (ideally, the screen that was previous its full screen mode)

What went wrong?
The app disappears completely. Its difficult to find until you realise that it has gone behind any browser windows you have open, and much worse, it has 'centred' strangely. I have a laptop, with 2 external displays arranged above-left and above-right of the laptop display (if you drew a line between the centre point of each display, you would have an inverted triangle)

The Android app appears to be centring in the physical centre of that triangle. Therefore, it is mostly off screen in the gaps between my monitors. The only presence (if you minimise the browser windows) is the extreme top-left of the app, on the above-right display - but it is so close to the bottom-right of that display, that you cannot easily/at all grab the drag bar and move it. Which leaves you unable to use the app.

At its core, I believe the issue is that the default positioning for apps going to windowed mode centres around the centre of the 'virtual viewport' as defined in the Displays section of settings. And in any multi display context, that isn't useful.

Did this work before? No 

Chrome version: 69.0.3497.120  Channel: n/a
OS Version: 10895.78.0
Flash Version: 31.0.0.108