I don't know why these patches are not already in LibreELEC source addon chromium. Maybe it breaks something on other systems than Intel.
There are three reasons things might be missing from our official Chromium add-on:
1) Nobody bothered to submit the changes
2) Nobody bothered to submit the changes
3) Nobody bothered to submit the changes
True that some things can be GPU specific, but unless things are submitted and tried/tested we wouldn't know.
I'd also like to point out that add-on maintenance does not happen by magic and Chromium has proven to be a pain in the arse to maintain due to frequently changing dependencies. Greater community participation in the maintenance process would be welcomed.