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* [fuchsia] enable boot time shader warmup even when LEGACY_FUCHSIA_EMBEDDER is defined * [fuchsia] decouple shader warmup from embedder api * [fuchsia] change warmup context flush() to flushAndSubmit() to reduce memory footprint of warmup * [fuchsia] Fix GPU resource lifecycle issue with shader warmup This fixes an issue with the shader warmup where gpu resources could end up deleted before the gpu work that needed them was complete, leading to GPU page faults. This was because although the sk_sp<SkSurface> will normally keep resources alive throughout its lifetime, the SurfaceProducerSurface will call VkDestroyMemory on the memory backing the SkSurface when it is deleted, even if the SkSurface wrapping that VkMemory is still alive. This change also deletes some related but unused code from CompositorContext that I noticed while refactoring.