code: def copyout(self, dest, src: memoryview):
      dest[:] = wgpu_device.queue.read_buffer(src, 0)
  
file_path: tinygrad/extra/backends/ops_webgpu.py
imports: from wgpu.utils.device import get_default_device
  from tinygrad.device import Compiled, Allocator
  from tinygrad.codegen.kernel import LinearizerOptions
  from tinygrad.renderer.cstyle import WGSLRenderer
  import wgpu
label_desc: Use image node_id 3 for calling the WebGpuAllocator obj's underlying member method code with example usage: obj.copyout(dest, src) without return types