Update RT views and framebuffer in vulkan after mipmaping

src/gpu/vk/GrVkRenderTarget.h

Index: src/gpu/vk/GrVkRenderTarget.h
diff --git a/src/gpu/vk/GrVkRenderTarget.h b/src/gpu/vk/GrVkRenderTarget.h
index 9628e3bdce8878a82ba5d599232bbae4ed5eb9ea..019f56743322c50d03193f1d013f03a1add40be2 100644
--- a/src/gpu/vk/GrVkRenderTarget.h
+++ b/src/gpu/vk/GrVkRenderTarget.h
@@ -103,6 +103,12 @@ protected:
         return fColorValuesPerPixel * fDesc.fWidth * fDesc.fHeight * colorBytes;
     }
 
+    void createFramebuffer(GrVkGpu* gpu);
+
+    const GrVkImageView*       fColorAttachmentView;
+    GrVkImage*                 fMSAAImage;
+    const GrVkImageView*       fResolveAttachmentView;
+
 private:
     GrVkRenderTarget(GrVkGpu* gpu,
                      SkBudgeted,
@@ -125,15 +131,10 @@ private:
 
     bool completeStencilAttachment() override;
 
-    void createFramebuffer(GrVkGpu* gpu);
-
     void releaseInternalObjects();
     void abandonInternalObjects();
 
     const GrVkFramebuffer*     fFramebuffer;
-    const GrVkImageView*       fColorAttachmentView;
-    GrVkImage*                 fMSAAImage;
-    const GrVkImageView*       fResolveAttachmentView;
     int                        fColorValuesPerPixel;
 
     // This is a cached pointer to a simple render pass. The render target should unref it