This extension is relied on by dEQP-VK.robustness.image_robustness.*
but it is only checked for since dEQP 1.2.5.

Tests: dEQP-VK.*
Bug: b/159329067
Bug: b/167692239
Change-Id: I52cc47302534537b4c95ea01b19308d9d39d9632
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/51128Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>