Vulkan: Suppress flaky test on Nexus5X

src/tests/gl_tests/StateChangeTest.cpp

@@ -1305,6 +1305,9 @@ void SimpleStateChangeTest::simpleDrawWithColor(const GLColor &color)
 // frame.
 TEST_P(SimpleStateChangeTest, DrawArraysThenDrawElements)
 {
+    // http://anglebug.com/3124: Flaky on Nexus5X.
+    ANGLE_SKIP_TEST_IF(IsAndroid() && IsVulkan());
+
     ANGLE_GL_PROGRAM(program, essl1_shaders::vs::Simple(), essl1_shaders::fs::Blue());
     glUseProgram(program);