WallpaperManagerBrowserTest.DisplayChange is flaky on ChromiumOS Ozone tests:

https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Ozone%20Tests%20%281%29

Frequency: First spotted 6 builds ago, since then one more flake appeared.

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WallpaperManagerBrowserTest.DisplayChange (run #1):
[ RUN      ] WallpaperManagerBrowserTest.DisplayChange
[28713:28713:0213/041358.258422:WARNING:audio_manager.cc(322)] Multiple instances of AudioManager detected
[28713:28713:0213/041358.258462:WARNING:audio_manager.cc(279)] Multiple instances of AudioManager detected
[28713:28738:0213/041358.276421:ERROR:service_manager.cc(209)] Connection InterfaceProviderSpec prevented service: content_browser from binding interface: prefs::mojom::PreferencesServiceFactory exposed by: preferences
[28713:28713:0213/041358.309151:WARNING:signin_screen_policy_provider.cc(61)] Denying load of Extension  : mhjfbmdgcfjbbpaeojofohoefgiehjai / Chromium PDF Viewer because of 'signin_screen' is only allowed for packaged apps, but this is a extension.
[28713:28734:0213/041358.312575:WARNING:freezer_cgroup_process_manager.cc(61)] Cgroup freezer does not exist or is not writable. Unable to freeze renderer processes.
[28713:28713:0213/041358.333452:WARNING:signin_screen_policy_provider.cc(61)] Denying load of Extension  : mhjfbmdgcfjbbpaeojofohoefgiehjai / Chromium PDF Viewer because of 'signin_screen' is only allowed for packaged apps, but this is a extension.
../../chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_browsertest.cc:668: Failure
Value of: WallpaperManager::Get()->GetAppropriateResolution()
  Actual: 1
Expected: WallpaperManager::WALLPAPER_RESOLUTION_LARGE
Which is: 0
[  FAILED  ] WallpaperManagerBrowserTest.DisplayChange, where TypeParam =  and GetParam() =  (304 ms)

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