angle_end2end_tests: BlendIntegerTest fails on Intel Vulkan driver
This bug was found by ANGLE -- . Most likely the driver implementation doesn't strictly follow the spec regarding "Blending applies only to fixed-point and floating-point color attachments. If the color attachment has an integer format, blending is not applied.". To reproduce the bug, simply run "angle_end2end_tests.exe --gtest_filter=BlendIntegerTest.UI32/ES3_Vulkan" with the attach file on a Ubuntu 19 machine. The latest mesa(Mesa 20.0.3 git-a6804815) is also reproducible.