Update RT views and framebuffer in vulkan after mipmaping

src/gpu/vk/GrVkTextureRenderTarget.h

Index: src/gpu/vk/GrVkTextureRenderTarget.h
diff --git a/src/gpu/vk/GrVkTextureRenderTarget.h b/src/gpu/vk/GrVkTextureRenderTarget.h
index 6ea332a0ae2ed098ebd8a56befbbc75e2d35be68..225951106612350fc82012f8e189aa3bab23895c 100644
--- a/src/gpu/vk/GrVkTextureRenderTarget.h
+++ b/src/gpu/vk/GrVkTextureRenderTarget.h
@@ -33,6 +33,8 @@ public:
                                                                      GrWrapOwnership,
                                                                      const GrVkImageInfo*);
 
+    bool updateForMipmap(GrVkGpu* gpu, const GrVkImageInfo& newInfo);
+
 protected:
     void onAbandon() override {
         GrVkRenderTarget::onAbandon();