Add transfer buffer support.

src/gpu/gl/GrGLTransferBuffer.h

 /*
- * Copyright 2011 Google Inc.
+ * 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 GrGLIndexBuffer_DEFINED
-#define GrGLIndexBuffer_DEFINED
+#ifndef GrGLTransferBuffer_DEFINED
+#define GrGLTransferBuffer_DEFINED
 
-#include "GrIndexBuffer.h"
+#include "GrTransferBuffer.h"
 #include "GrGLBufferImpl.h"
 #include "gl/GrGLInterface.h"
 
 class GrGLGpu;
 
-class GrGLIndexBuffer : public GrIndexBuffer {
+class GrGLTransferBuffer : public GrTransferBuffer {
 
 public:
     typedef GrGLBufferImpl::Desc Desc;
 
-    GrGLIndexBuffer(GrGLGpu* gpu, const Desc& desc);
+    GrGLTransferBuffer(GrGLGpu* gpu, const Desc& desc, GrGLenum type);
 
     GrGLuint bufferID() const { return fImpl.bufferID(); }
     size_t baseOffset() const { return fImpl.baseOffset(); }
 
 protected:
     void onAbandon() override;
     void onRelease() override;
     void setMemoryBacking(SkTraceMemoryDump* traceMemoryDump,
                           const SkString& dumpName) const override;
 
 private:
     void* onMap() override;
     void onUnmap() override;
-    bool onUpdateData(const void* src, size_t srcSizeInBytes) override;
 
     GrGLGpu* getGpuGL() const {
         SkASSERT(!this->wasDestroyed());
         return (GrGLGpu*)(this->getGpu());
     }
 
     GrGLBufferImpl fImpl;
 
-    typedef GrIndexBuffer INHERITED;
+    typedef GrTransferBuffer INHERITED;
 };
 
 #endif