Adding Blink-side support for EXT_shader_texture_lod

Source/core/html/canvas/EXTShaderTextureLOD.h

+// Copyright 2014 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.
+
+#ifndef EXTShaderTextureLOD_h
+#define EXTShaderTextureLOD_h
+
+#include "bindings/v8/ScriptWrappable.h"
+#include "core/html/canvas/WebGLExtension.h"
+#include "wtf/PassRefPtr.h"
+
+namespace WebCore {
+
+class EXTShaderTextureLOD FINAL : public WebGLExtension, public ScriptWrappable {
+public:
+    static PassRefPtr<EXTShaderTextureLOD> create(WebGLRenderingContextBase*);
+    static bool supported(WebGLRenderingContextBase*);
+    static const char* extensionName();
+
+    virtual ~EXTShaderTextureLOD();
+    virtual WebGLExtensionName name() const OVERRIDE;
+
+private:
+    EXTShaderTextureLOD(WebGLRenderingContextBase*);
+};
+
+} // namespace WebCore
+
+#endif // EXTShaderTextureLOD_h