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<!-- start_original_pr_link --> Reverts: flutter/flutter#167527 <!-- end_original_pr_link --> <!-- start_initiating_author --> Initiated by: gmackall <!-- end_initiating_author --> <!-- start_revert_reason --> Reason for reverting: failing postsubmit `Linux_mokey flutter_engine_group_performance` <!-- end_revert_reason --> <!-- start_original_pr_author --> Original PR Author: jonahwilliams <!-- end_original_pr_author --> <!-- start_reviewers --> Reviewed By: {jason-simmons} <!-- end_reviewers --> <!-- start_revert_body --> This change reverts the following previous change: Attempt to speed up vulkan startup by ensuring vulkan driver initialization happens on raster thread. Prev. we immediately initialized the impeller::Context, unfortunately setting up the vulkan context can take upwards of 100ms. This time is running on the platform thread and blocking startup. Instead, I attempt to hide/defer as much as possible what backend is being used - this requires us to access the impeller context via a shared_future in some cases instead of immediately knowing it is valid. <!-- end_revert_body --> Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>