Initial commit of all the NXT integration.

More like squashed history, contributors were:
 - Kai Ninomiya
 - Corentin Wallez

src/backend/opengl/GeneratedCodeIncludes.h

@@ -0,0 +1,21 @@
+// Copyright 2017 The NXT Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "OpenGLBackend.h"
+#include "CommandBufferGL.h"
+#include "PipelineGL.h"
+#include "PipelineLayoutGL.h"
+#include "SamplerGL.h"
+#include "ShaderModuleGL.h"
+#include "TextureGL.h"