Vulkan: Allocate descriptor pools with layouts Descriptor set layouts and pools are very tightly coupled, since their binding types and counts must match to ensure the number of available descriptor sets within a pool remains accurate. To enforce this, the descriptor pools will now keep a copy of the VkDescriptorSetLayout that the pool was created for, which is verified when a descriptor set is allocated from the pool. If the handles don't match, an ASSERT() will fire. Bug: angleproject:5033 Test: CQ Change-Id: I4faf82c24f31052e57b656c968788bb0c131b619 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2407282 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Tim Van Patten <timvp@google.com>