Suppress flaky failure with MacOS/NVIDIA/OPENGL

Seeing intermittent failure on this test only on MacOS/NVIDIA/OPENGL.
Suppress for now.

Bug: angleproject:4258
Change-Id: Ibda30954019410e3b6d069986b2cd0ad26533c00
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1984850
Reviewed-by: Shrek Shao <shrekshao@google.com>
Commit-Queue: Shrek Shao <shrekshao@google.com>

Author: shrekshao

src/tests/gl_tests/VertexAttributeTest.cpp

@@ -1203,6 +1203,9 @@ TEST_P(VertexAttributeOORTest, ANGLEDrawArraysOutOfBoundsCases)
 // Verify that using a different start vertex doesn't mess up the draw.
 TEST_P(VertexAttributeTest, DrawArraysWithBufferOffset)
 {
+    // anglebug.com/4258
+    ANGLE_SKIP_TEST_IF(IsOpenGL() && IsNVIDIA() && IsOSX());
+
     // anglebug.com/4163
     ANGLE_SKIP_TEST_IF(IsD3D11() && IsNVIDIA() && IsWindows7());