See https://github.com/flutter/engine/blob/6bc60c8a98775f9b11dfa7ce7baf4a6665b3f166/shell/platform/android/android_context_vulkan_impeller.cc#L44 and flutter/engine#42028 (comment)

Fixing this will probably require some light refactoring to make the shell create the worker loop instead of DartVM::DartVM and AndroidContextVulkanImpeller and wherever it ends up for the Metal concurrent encoding work.

/cc @jason-simmons @chinmaygarde @gaaclarke @jonahwilliams