The features he's talking about were added to Chrome for ChromeOS/Win8 tablet stylus drawing support, which they refer to as "inking". They're kind of a specific fast path for that use case. They were not tested for any other use case and as a result tend not to be usable in practice due to various caveats, unfortunately.

I’m guessing “inking” is a autocorrect of a typo that was meant to be “input”

Actually I was referring to drawing with a stylus on a drawing app like Google Keep drawing notes or https://canvas.apps.chrome/.

From hereon it shall be inking

[0]: https://en.wikipedia.org/wiki/Inking