Add automatic generation of mipmaps to Vulkan

src/gpu/vk/GrVkStencilAttachment.cpp

Index: src/gpu/vk/GrVkStencilAttachment.cpp
diff --git a/src/gpu/vk/GrVkStencilAttachment.cpp b/src/gpu/vk/GrVkStencilAttachment.cpp
index 3af5488ed7cb6fbec2dbd57eafcfddf3af2d12f3..a876aea15f9626feadb7f08761dfe2552ffc1dd5 100644
--- a/src/gpu/vk/GrVkStencilAttachment.cpp
+++ b/src/gpu/vk/GrVkStencilAttachment.cpp
@@ -51,7 +51,7 @@ GrVkStencilAttachment* GrVkStencilAttachment::Create(GrVkGpu* gpu,
 
     const GrVkImageView* imageView = GrVkImageView::Create(gpu, imageResource->fImage,
                                                            format.fInternalFormat,
-                                                           GrVkImageView::kStencil_Type);
+                                                           GrVkImageView::kStencil_Type, 1);
     if (!imageView) {
         imageResource->unref(gpu);
         return nullptr;