Vulkan: Avoid double-setting the fragment shading rate Because there were two handlers for fragment shading rate, one for the QCOM extension and one for EXT, every time the render pass started, it would set the fragment shading rate to 1x1 twice. Bug: angleproject:420310117 Change-Id: I905c504c7a7b80b5e7173e5d6a7cabe6f271e7a1 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6995362 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: mohan maiya <m.maiya@samsung.com> Reviewed-by: Charlie Lao <cclao@google.com>