Fix vulkan build

src/gpu/vk/GrVkBuffer.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrVkBuffer_DEFINED
 #define GrVkBuffer_DEFINED
 
 #include "GrVkResource.h"
 #include "vk/GrVkDefines.h"
 #include "vk/GrVkTypes.h"
 
 class GrVkGpu;
 
 /**
  * This class serves as the base of GrVk*Buffer classes. It was written to avoid code
  * duplication in those classes.
  */
 class GrVkBuffer : public SkNoncopyable {
 public:
-    ~GrVkBuffer() {
+    virtual ~GrVkBuffer() {
         // either release or abandon should have been called by the owner of this object.
         SkASSERT(!fResource);
     }
 
     VkBuffer                    buffer() const { return fResource->fBuffer; }
     const GrVkAlloc&            alloc() const { return fResource->fAlloc; }
     const GrVkRecycledResource* resource() const { return fResource; }
     size_t                      size() const { return fDesc.fSizeInBytes; }
     VkDeviceSize                offset() const { return fOffset;  }
 
@@ skipping 70 matching lines @@
 
     Desc                    fDesc;
     const Resource*         fResource;
     VkDeviceSize            fOffset;
     void*                   fMapPtr;
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif