Introduce GLStubApi

ui/gl/gl_stub_api_base.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This file implements a stub GL Interface for unit testing. The interface
+// corresponds to the set of functionally distinct GL functions defined in
+// generate_bindings.py, which may originate from either desktop GL or GLES.
+
+#ifndef UI_GL_GL_STUB_API_BASE_H_
+#define UI_GL_GL_STUB_API_BASE_H_
+
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_export.h"
+#include "ui/gl/gl_gl_api_implementation.h"
+
+namespace gl {
+
+class GL_EXPORT GLStubApiBase : public gl::GLApi {
+ public:
+  GLStubApiBase() {}
+  ~GLStubApiBase() override {}
+
+#include "ui/gl/gl_stub_autogen_gl.h"
+};
+
+}  // namespace gl
+
+#endif  // UI_GL_GL_STUB_API_BASE_H_