a4b4cae1a89050456eb4f5a5dfb89cd08876fa72
Allow creating a TextureMTL instance that is backend by a CAMetalLayer, which only acquires the drawable (and texture) lazily. I split TextureMTL into two subclasses, one that has the standard wrapping behavior of a MTLTexture, and the other that holds a drawable. This is part of the foundational work for "removing drawable acquisition latency", as we need to delay aquisition of the drawable texture to a worker thread. The drawable backed texture is only used in tests for now. Part of https://github.com/flutter/flutter/issues/138490
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