Add transfer buffer support.

src/gpu/gl/GrGLTransferBuffer.h

Index: src/gpu/gl/GrGLTransferBuffer.h
diff --git a/src/gpu/gl/GrGLIndexBuffer.h b/src/gpu/gl/GrGLTransferBuffer.h
old mode 100644
new mode 100755
similarity index 70%
copy from src/gpu/gl/GrGLIndexBuffer.h
copy to src/gpu/gl/GrGLTransferBuffer.h
index 628970a0fa4d1089581af2b787b8a21ba1ef4275..ff9caeea7454270195d504f47a8d855c43992037
--- a/src/gpu/gl/GrGLIndexBuffer.h
+++ b/src/gpu/gl/GrGLTransferBuffer.h
@@ -1,25 +1,25 @@
 /*
- * 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(); }
@@ -33,7 +33,6 @@ protected:
 private:
     void* onMap() override;
     void onUnmap() override;
-    bool onUpdateData(const void* src, size_t srcSizeInBytes) override;
 
     GrGLGpu* getGpuGL() const {
         SkASSERT(!this->wasDestroyed());
@@ -42,7 +41,7 @@ private:
 
     GrGLBufferImpl fImpl;
 
-    typedef GrIndexBuffer INHERITED;
+    typedef GrTransferBuffer INHERITED;
 };
 
 #endif