I am not entirely sure why context creation with no surface and no config is failing on ANGLE and Android but I will change my new approach to only happen with MOZ_GTK and that should clear up the failures.
Bug 1843782 Comment 84 Edit History
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I am not entirely sure why context creation with no surface and no config is failing on ANGLE and Android but I will change my new approach to only happen with MOZ_WIDGET_GTK and that should clear up the failures.