| PASS mapReadAsync, unmap, and destroy on a GPUBuffer. | |
| PASS GPUBuffer.mapReadAsync on a buffer created via GPUDevice.createBufferMapped. | |
| PASS Reject a map read on a buffer not created with MAP_READ usage. | |
| PASS Reject a map read on a mapped GPUBuffer. | |
| PASS Reject a pending map read if GPUBuffer is unmapped. | |