Vulkan: Bug fix in GL_QCOM_shading_rate A default value of _1x1 for mShadingRate interacts badly with sample shading state on some vendors. Instead set the default to Undefined and return early in such cases. Bug: angleproject:7172 Change-Id: If0a280090e6611817d2f5d75929ef2b654ddb186 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3658245 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: mohan maiya <m.maiya@samsung.com>