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We add the concept of the descriptor set as a way to describe shader resources into Filament. This is a comprehensive change across Filament. Info on descriptor sets is available here: https://docs.vulkan.org/spec/latest/chapters/descriptorsets.html Co-authored-by: Benjamin Doherty <bendoherty@google.com> Co-authored-by: Mathias Agopian <mathias@google.com> Co-authored-by: Sungun Park <sungunpark@google.com>