In a world of large phones, it makes sense to move commonly-used actions to the bottom of the screen. A new flag in Chrome Dev and Canary, only described as 'Chrome Home,' moves Chrome's address bar to the bottom of the screen when enabled.
This is clearly unfinished, as the space where the address bar occupied at the top is completely blank. This actually reminds me of Windows 10 Mobile's Edge browser, where the navigation bar is also at the bottom.
The name of the flag, Chrome Home, is a bit puzzling. The name doesn't really indicate anything about an address bar; perhaps this is just part of a greater feature. Either way, you can enable this in Chrome Dev and Canary by pasting chrome://flags/#enable-chrome-home into Chrome, tapping the highlighted select menu, tapping Enabled, and restarting the browser.