Screen saver blanks the screen when the video is playing

[ngrigoriev]

I have noticed that approximately since a month or so the phone started to turn off the screen after a couple of minutes while playing the video.

Phone: Pixel 7 Pro
GrapheneOS version: latest as of today (2025110800)

Steps to reproduce:

1. Launch x.com in default browser (Vanadium)
2. Start playing a video that is long enough. Keep the device in portrait orientation. Do not activate full-screen mode.
3. Observe that the screen will turn blank after ~3 minutes or so. The device locks.
4. Unlock the phone, the video will result playing immediately.

I am sure in the past playing the video in Vanadium was preventing the phone from locking.