layers: Validation for VK_EXT_ycbcr_image_arrays
diff --git a/layers/vk_format_utils.cpp b/layers/vk_format_utils.cpp
index c4b9959..40f603b 100644
--- a/layers/vk_format_utils.cpp
+++ b/layers/vk_format_utils.cpp
@@ -1338,3 +1338,7 @@
         return (dstSize == srcSize);
     }
 }
+
+VK_LAYER_EXPORT bool FormatRequiresYcbcrConversion(VkFormat format) {
+    return format >= VK_FORMAT_G8B8G8R8_422_UNORM && format <= VK_FORMAT_G16_B16_R16_3PLANE_444_UNORM;
+}