Add transfer buffer support.

src/gpu/gl/GrGLVertexBuffer.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLVertexBuffer.h"
 #include "GrGLGpu.h"
 #include "SkTraceMemoryDump.h"
 
 GrGLVertexBuffer::GrGLVertexBuffer(GrGLGpu* gpu, const Desc& desc)
-    : INHERITED(gpu, desc.fSizeInBytes, desc.fDynamic, 0 == desc.fID)
+    : INHERITED(gpu, desc.fSizeInBytes, GrGLBufferImpl::kDynamicDraw_Usage == desc.fUsage,
+                0 == desc.fID)
     , fImpl(gpu, desc, GR_GL_ARRAY_BUFFER) {
     this->registerWithCache();
 }
 
 void GrGLVertexBuffer::onRelease() {
     if (!this->wasDestroyed()) {
         fImpl.release(this->getGpuGL());
     }
 
     INHERITED::onRelease();
@@ skipping 26 matching lines @@
     }
 }
 
 void GrGLVertexBuffer::setMemoryBacking(SkTraceMemoryDump* traceMemoryDump,
                                         const SkString& dumpName) const {
     SkString buffer_id;
     buffer_id.appendU32(this->bufferID());
     traceMemoryDump->setMemoryBacking(dumpName.c_str(), "gl_buffer",
                                       buffer_id.c_str());
 }