Revert of Consolidate GPU buffer implementations

src/gpu/gl/GrGLIndexBuffer.cpp

Index: src/gpu/gl/GrGLIndexBuffer.cpp
diff --git a/src/gpu/gl/GrGLIndexBuffer.cpp b/src/gpu/gl/GrGLIndexBuffer.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5a794ad8240659a61957e0622837447022a5f2e1
--- /dev/null
+++ b/src/gpu/gl/GrGLIndexBuffer.cpp
@@ -0,0 +1,60 @@
+/*
+ * 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 "GrGLIndexBuffer.h"
+#include "GrGLGpu.h"
+#include "SkTraceMemoryDump.h"
+
+GrGLIndexBuffer::GrGLIndexBuffer(GrGLGpu* gpu, const Desc& desc)
+    : INHERITED(gpu, desc.fSizeInBytes, GrGLBufferImpl::kDynamicDraw_Usage == desc.fUsage,
+                0 == desc.fID)
+    , fImpl(gpu, desc, GR_GL_ELEMENT_ARRAY_BUFFER) {
+    this->registerWithCache();
+}
+
+void GrGLIndexBuffer::onRelease() {
+    if (!this->wasDestroyed()) {
+        fImpl.release(this->getGpuGL());
+    }
+
+    INHERITED::onRelease();
+}
+
+void GrGLIndexBuffer::onAbandon() {
+    fImpl.abandon();
+    INHERITED::onAbandon();
+}
+
+void* GrGLIndexBuffer::onMap() {
+    if (!this->wasDestroyed()) {
+        return fImpl.map(this->getGpuGL());
+    } else {
+        return nullptr;
+    }
+}
+
+void GrGLIndexBuffer::onUnmap() {
+    if (!this->wasDestroyed()) {
+        fImpl.unmap(this->getGpuGL());
+    }
+}
+
+bool GrGLIndexBuffer::onUpdateData(const void* src, size_t srcSizeInBytes) {
+    if (!this->wasDestroyed()) {
+        return fImpl.updateData(this->getGpuGL(), src, srcSizeInBytes);
+    } else {
+        return false;
+    }
+}
+
+void GrGLIndexBuffer::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());
+}