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The Impeller Vulkan back end caches command pools in thread-local storage. These caches can grow unbounded unless the embedder calls ContextVK::DisposeThreadLocalCachedResources() If the GPUSurfaceVulkanImpeller does not have a delegate, then AcquireFrame will invoke DisposeThreadLocalCachedResources through its call to SurfaceContextVK::AcquireNextSurface. With a delegate, AcquireFrame follows a different code path that must explicitly call DisposeThreadLocalCachedResources.