We've known about Google Chrome's quick page-sharing through dino-themed QR codes since last year. After an initial release in Canary and more development, the feature is now finally available in the latest stable version of Chrome, 84. It's working properly on both Android and desktops, but you'll need to manually enable the flag to get it going.
QR codes on Android
On Android with the new Chrome 84 release, QR codes are functional but they're linked to the hidden Sharing hub that we first uncovered in January. To get to the QR interface, you need to turn on two different flags in chrome://flags
Restart Chrome (twice is usually better than once) after you've enabled both, and then tap to share any page. The custom sharing hub will pop up from the bottom, clad with multiple options including the QR Code one. Selecting that opens a new fullscreen interface where you can either share the current page's generated code or scan one from another nearby device.
You can also download the QR code to share it in other apps on your phone. Here's the one for androidpolice.com:
QR codes on desktops
QR codes are also live on both my Mac with Chrome v84 and my Pixelbook with Chrome OS v84. (They should also be there on Windows and Linux.) I did have to enable the flag manually, though, and restart the browser to get it to work:
To share a page via QR, you can tap the corresponding icon at the far end of the URL address bar (though it sometimes doesn't pop up) or right click on an empty space in the page and choose Generate QR code for this page. The latter is more reliable.
The code will be generated to be scanned by any nearby phone, but you can also download the image to send it via other means. Additionally, the URL field in that pop-up menu is editable, so you can type or paste another address and the code will change on the spot to accommodate it.
There's no way to scan codes on the desktop. That makes sense because you're less likely to be carrying your computer and pointing its camera to scan, but with Chrome OS tablets being a thing, the feature should be added there. It'd also be cool if Chrome could recognize (thanks to the dino in the middle) static images of QR codes embedded in pages and convert them into a link without having to scan them through a nearby phone's camera.
Besides having to manually enable the flags and restart Chrome, there's nothing else you need to do to trigger the feature. Just make sure you're on Chrome 84 (APK Mirror) or above and follow the instructions to get it working.