Repro steps:

Build Chrome for Chrome OS

My gn args:
use_goma = true
#enable_wayland_server = true
#use_xkbcommon = true
is_component_build = true
is_official_build = false
dcheck_always_on = false
is_debug = true
is_asan = false
use_ozone = true
ozone_auto_platforms = true
ozone_platform_x11 = true
ozone_platform = "x11"
target_os = "chromeos"
enable_nacl = false
goma_dir = "/usr/local/google/Projects/goma"


2. run:

out/oxygen/chrome  --no-sandbox --user-data-dir="~/tmp/mash-data2" --enable-surface-synchronization --ash-host-window-bounds=900x900,950+0-900x900*2 --ash-dev-shortcuts --ash-debug-shortcuts --use-first-display-as-internal --show-debug-borders

3. Navigate to slashdot.org

4. Move window across displays.

5. Raster of OOPIFs seems to be broken. Scrolling up and down a couple of times fixes it.