Create GrVkCopyPipeline class

src/gpu/vk/GrVkPipeline.h

Index: src/gpu/vk/GrVkPipeline.h
diff --git a/src/gpu/vk/GrVkPipeline.h b/src/gpu/vk/GrVkPipeline.h
index bec4aeb6002fcec20333d4ca6d0de128370e6525..2565185712d1d7ee41a3a1993ed6ac139342bc48 100644
--- a/src/gpu/vk/GrVkPipeline.h
+++ b/src/gpu/vk/GrVkPipeline.h
@@ -43,16 +43,14 @@ public:
     }
 #endif
 
-private:
+protected:
     GrVkPipeline(VkPipeline pipeline) : INHERITED(), fPipeline(pipeline) {}
 
-    GrVkPipeline(const GrVkPipeline&);
-    GrVkPipeline& operator=(const GrVkPipeline&);
+    VkPipeline  fPipeline;
 
+private:
     void freeGPUData(const GrVkGpu* gpu) const override;
 
-    VkPipeline  fPipeline;
-
     typedef GrVkResource INHERITED;
 };