Revert of Consolidate GPU buffer implementations

src/gpu/gl/GrGLTransferBuffer.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrGLTransferBuffer.h"
+#include "GrGLGpu.h"
+#include "SkTraceMemoryDump.h"
+
+GrGLTransferBuffer::GrGLTransferBuffer(GrGLGpu* gpu, const Desc& desc, GrGLenum type)
+    : INHERITED(gpu, desc.fSizeInBytes)
+    , fImpl(gpu, desc, type) {
+    this->registerWithCache();
+}
+
+void GrGLTransferBuffer::onRelease() {
+    if (!this->wasDestroyed()) {
+        fImpl.release(this->getGpuGL());
+    }
+
+    INHERITED::onRelease();
+}
+
+void GrGLTransferBuffer::onAbandon() {
+    fImpl.abandon();
+    INHERITED::onAbandon();
+}
+
+void* GrGLTransferBuffer::onMap() {
+    if (!this->wasDestroyed()) {
+        return fImpl.map(this->getGpuGL());
+    } else {
+        return nullptr;
+    }
+}
+
+void GrGLTransferBuffer::onUnmap() {
+    if (!this->wasDestroyed()) {
+        fImpl.unmap(this->getGpuGL());
+    }
+}
+
+void GrGLTransferBuffer::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());
+}