message: Set point size value for vertex shader in OptionalVertexInputTest
  When pipeline topology is set to Point_List, PointSize must be written
  in vertex shader for Vulkan backend.
diff: @@ -534,6 +534,7 @@ TEST_P(OptionalVertexInputTest, Basic) {
  #version 450
  void main() {
  gl_Position = vec4(0.0f, 0.0f, 0.0f, 1.0f);
  + gl_PointSize = 1.0;
  })");
  dawn::ShaderModule fsModule =
  