Recycle small uniform buffers.

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
 
@@ skipping 35 matching lines @@
         kCopyWrite_Type,
     };
 
 protected:
     struct Desc {
         size_t      fSizeInBytes;
         Type        fType;         // vertex buffer, index buffer, etc.
         bool        fDynamic;
     };
 
-    class Resource : public GrVkResource {
+    class Resource : public GrVkRecycledResource {
     public:
         Resource(VkBuffer buf, const GrVkAlloc& alloc, Type type)
             : INHERITED(), fBuffer(buf), fAlloc(alloc), fType(type) {}
 
 #ifdef SK_TRACE_VK_RESOURCES
         void dumpInfo() const override {
             SkDebugf("GrVkBuffer: %d (%d refs)\n", fBuffer, this->getRefCnt());
         }
 #endif
         VkBuffer           fBuffer;
         GrVkAlloc          fAlloc;
         Type               fType;
 
     private:
         void freeGPUData(const GrVkGpu* gpu) const override;
 
-        typedef GrVkResource INHERITED;
+        void onRecycle(GrVkGpu* gpu) const override { this->unref(gpu); }
+
+        typedef GrVkRecycledResource INHERITED;
     };
 
     // convenience routine for raw buffer creation
     static const Resource* Create(const GrVkGpu* gpu,
                                   const Desc& descriptor);
 
     GrVkBuffer(const Desc& desc, const GrVkBuffer::Resource* resource)
         : fDesc(desc), fResource(resource), fOffset(0), fMapPtr(nullptr) {
     }
 
@@ skipping 13 matching lines @@
 
     Desc                    fDesc;
     const Resource*         fResource;
     VkDeviceSize            fOffset;
     void*                   fMapPtr;
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif