[Fix, Test] (MG_Backend/DirectVulkan): gl_FragCoord on the default framebuffer reports GL's window origin - the stored row is not the window row once the viewport rect is converted

MobileGL/MG_IntegrationTest/CMakeLists.txt

@@ -56,6 +56,7 @@ add_executable(MobileGLIntegrationTest
     Scenarios/PipelineFailureScenario.cpp
     Scenarios/AdvertisedLimitsScenario.cpp
     Scenarios/PixelStoreSweepScenario.cpp
+    Scenarios/FragCoordOriginScenario.cpp
 )
 
 target_include_directories(MobileGLIntegrationTest PRIVATE