This is the correct behavior according to the spec. This CL modifies
MetalSurface, XcbSurfaceKHR and XlibSurfaceKHR.

Bug: swiftshader: 140
Change-Id: I3f1829506a9d95c11c07f6a3a9ea1e7557e78725
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38648
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Jonah Ryan-Davis <jonahr@google.com>