Properly recycle uniform buffers in vulkan

src/gpu/vk/GrVkUniformBuffer.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 GrVkUniformBuffer_DEFINED
 #define GrVkUniformBuffer_DEFINED
 
@@ skipping 27 matching lines @@
     class Resource : public GrVkBuffer::Resource {
     public:
         Resource(VkBuffer buf, const GrVkAlloc& alloc)
             : INHERITED(buf, alloc, kUniform_Type) {}
 
         void onRecycle(GrVkGpu* gpu) const override;
 
         typedef GrVkBuffer::Resource INHERITED;
     };
 
+    const GrVkBuffer::Resource* createResource(GrVkGpu* gpu,
+                                               const GrVkBuffer::Desc& descriptor) override;
+
     GrVkUniformBuffer(GrVkGpu* gpu, const GrVkBuffer::Desc& desc,
                       const GrVkUniformBuffer::Resource* resource)
         : INHERITED(desc, resource)
         , fGpu(gpu) {}
 
     GrVkGpu* fGpu;
 
     typedef GrVkBuffer INHERITED;
 };
 
 #endif