Cache render targets that render to wrapped textures

src/gpu/gl/GrGLTransferBuffer.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 GrGLTransferBuffer_DEFINED
 #define GrGLTransferBuffer_DEFINED
 
@@ skipping 10 matching lines @@
 
     GrGLTransferBuffer(GrGLGpu* gpu, const Desc& desc, GrGLenum type);
 
     GrGLuint bufferID() const { return fImpl.bufferID(); }
     size_t baseOffset() const { return fImpl.baseOffset(); }
     GrGLenum bufferType() const { return fImpl.bufferType(); }
 
 protected:
     void onAbandon() override;
     void onRelease() override;
+    bool refsWrappedResources() const override { return false; }
     void setMemoryBacking(SkTraceMemoryDump* traceMemoryDump,
                           const SkString& dumpName) const override;
 
 private:
     void* onMap() override;
     void onUnmap() override;
 
     GrGLGpu* getGpuGL() const {
         SkASSERT(!this->wasDestroyed());
         return (GrGLGpu*)(this->getGpu());
     }
 
     GrGLBufferImpl fImpl;
 
     typedef GrTransferBuffer INHERITED;
 };
 
 #endif