b4efc3450e
Reverts flutter/engine#47209 This actually did regress things, I benchmarked poorly! see https://flutter-flutter-perf.skia.org/e/?queries=device_type%3DPixel_7_Pro%26sub_result%3D90th_percentile_frame_rasterizer_time_millis%26sub_result%3D99th_percentile_frame_rasterizer_time_millis%26sub_result%3Daverage_frame_rasterizer_time_millis%26sub_result%3Dworst_frame_rasterizer_time_millis%26test%3Dnew_gallery_impeller__transition_perf I did check https://developer.arm.com/documentation/101897/0301/CPU-overheads/Vulkan-CPU-memory-mapping and we're following the expected advice there. Without a much deeper investigation though we may not have any idea what to do