LibGL: Add simple implementation of buffer objects

For now, buffers are only implemented on the LibGL side, however in the
future buffer objects should be stored in LibGPU.

Userland/Libraries/LibGL/Buffer/Buffer.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2022, cflip <cflip@cflip.net>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/ByteBuffer.h>
+#include <AK/RefCounted.h>
+
+namespace GL {
+
+// FIXME: For now, this is basically just a wrapper around ByteBuffer, but in
+//        the future buffer data should be stored in LibGPU.
+class Buffer : public RefCounted<Buffer> {
+public:
+    ErrorOr<void> set_data(void const*, size_t);
+    void replace_data(void const*, size_t offset, size_t size);
+
+    size_t size();
+    void* data();
+    void* offset_data(size_t);
+
+private:
+    ByteBuffer m_data;
+};
+
+}