Since the graphics driver directly affects the GPU, it usually requires a major software update to be updated. OEMS so far usually update the graphics driver on their GPU when they update their device to a new version of Android.
This is will be possible by Project Treble, updating the GPU drivers through the Play Store is not a small thing, and it likely points to the base OS in Android O being extremely modular in nature.
This should make it easier for OEMs and chip makers to push out driver updates quickly to their devices without much of a hassle. Whether they do that or not is something that remains to be seen.
Google has long promised faster Android updates with almost every version of Android, but with Android O and Project Treble, for the first time, it looks like the company will be able to keep its word.
Source : Android Developers