With the DRI_DRIVER_DIR issue out of the way, I see:

WARNING:ozone_platform_wayland.cc(273)] Failed to find drm render node path.
WARNING:wayland_buffer_manager_gpu.cc(437)] Failed to initialize drm render 
node handle.

render node is present:
$ ls -al /dev/dri/
total 0
drwxr-xr-x   3 root root        100 Feb 16 18:32 .
drwxr-xr-x  22 root root       5800 Feb 17 08:00 ..
drwxr-xr-x   2 root root         80 Feb 17 08:00 by-path
crw-rw----+  1 root video  226,   0 Feb 17 08:00 card0
crw-rw----+  1 root render 226, 128 Feb 16 18:32 renderD128

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/2006646

Title:
  hwacc branch builds with minigbm switch to software compositor on amd.

Status in chromium-browser package in Ubuntu:
  In Progress

Bug description:
  This pertains to the hwacc branches of snap_from_source chromium
  builds.

  Following the guide-0.9.1, we switched from system gbm to minigbm. 
  (These switches are in args.gn)

  use_system_minigbm = false
  use_intel_minigbm = true
  use_amdgpu_minigbm = true

  This enables us to better support intel hardware.

  However, there seems to be a regression on other gpus.

  Chromium will switch to software compositing on amd.
  When I revert back to system gbm, I get hardware compositing again.

  See attached screenshot.

  To reproduce: build chromium in two different ways, and compare the
  output from the chrome://gpu url.

  tested on: Radeon RX580 GPU.

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