Use transfer buffer for BatchAtlas texture copies

src/gpu/vk/GrVkGpu.h

Index: src/gpu/vk/GrVkGpu.h
diff --git a/src/gpu/vk/GrVkGpu.h b/src/gpu/vk/GrVkGpu.h
index eeaacf3d1b08d407cc08277027b37220923d0998..f53a7b1a29d4864e11a7445a580b93298aa2439c 100644
--- a/src/gpu/vk/GrVkGpu.h
+++ b/src/gpu/vk/GrVkGpu.h
@@ -141,6 +141,10 @@ public:
 
     void finishDrawTarget() override;
 
+    GrFence SK_WARN_UNUSED_RESULT insertFence() const override;
+    bool waitFence(GrFence) const override;
+    void deleteFence(GrFence) const override;
+
     void generateMipmap(GrVkTexture* tex);
 
     bool updateBuffer(GrVkBuffer* buffer, const void* src, VkDeviceSize offset, VkDeviceSize size);
@@ -199,10 +203,10 @@ private:
                        int left, int top, int width, int height,
                        GrPixelConfig config, const SkTArray<GrMipLevel>&) override;
 
-    bool onTransferPixels(GrSurface*,
+    bool onTransferPixels(GrTexture*,
                           int left, int top, int width, int height,
                           GrPixelConfig config, GrBuffer* transferBuffer,
-                          size_t offset, size_t rowBytes) override { return false; }
+                          size_t offset, size_t rowBytes) override;
 
     // Ends and submits the current command buffer to the queue and then creates a new command
     // buffer and begins it. If sync is set to kForce_SyncQueue, the function will wait for all