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* Fix mip-map generation in unit-tests where the command buffer was not submitted. * Cleanup descriptor counts being always 1 in Vulkan code-gen. * Reworked capabilities. Platforms can add to the base capability set. * Vulkan backend picks between more available color and stencil formats. * Descriptor pools are dynamically sized. * Layout transitions are more explicit. Both allocated and swapchain images track their own layouts and redundant transitions are avoided. * Objects active in a pending command buffer are collected but the waits happen on a separate fence waiter. Thread is named "io.flutter.impeller.fence_waiter". * Added queue and command buffer instant markers for better traces. * Command pools and their buffers are now thread local. Fixes sync validation failure. * Debug reports are now more readable and command buffer and queue breadcrumbs will be displayed on a validation report. * Staging buffers are back. * Pipeline caches have been wired up. After 50 frames, the current Vulkan pipeline cache will be written out to disk for subsequent launches. Writes will happen on a background worker. * Runtime stages have been wired up. But the build rules to provide the right stages are still remaining. Fixes https://github.com/flutter/flutter/issues/121536 Fixes https://github.com/flutter/flutter/issues/121627 Fixes https://github.com/flutter/flutter/issues/121632 Fixes https://github.com/flutter/flutter/issues/120499