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diff --git a/gfx/angle/checkout/src/compiler/translator/TextureFunctionHLSL.h b/gfx/angle/checkout/src/compiler/translator/TextureFunctionHLSL.h
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+++ b/gfx/angle/checkout/src/compiler/translator/TextureFunctionHLSL.h
@@ -0,0 +1,77 @@
+//
+// Copyright 2016 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// TextureFunctionHLSL: Class for writing implementations of ESSL texture functions into HLSL
+// output. Some of the implementations are straightforward and just call the HLSL equivalent of the
+// ESSL texture function, others do more work to emulate ESSL texture sampling or size query
+// behavior.
+//
+
+#ifndef COMPILER_TRANSLATOR_TEXTUREFUNCTIONHLSL_H_
+#define COMPILER_TRANSLATOR_TEXTUREFUNCTIONHLSL_H_
+
+#include <set>
+
+#include "GLSLANG/ShaderLang.h"
+#include "compiler/translator/BaseTypes.h"
+#include "compiler/translator/Common.h"
+#include "compiler/translator/InfoSink.h"
+
+namespace sh
+{
+
+class TextureFunctionHLSL final : angle::NonCopyable
+{
+  public:
+    struct TextureFunction
+    {
+        // See ESSL 3.00.6 section 8.8 for reference about what the different methods below do.
+        enum Method
+        {
+            IMPLICIT,  // Mipmap LOD determined implicitly (standard lookup)
+            BIAS,
+            LOD,
+            LOD0,
+            LOD0BIAS,
+            SIZE,  // textureSize()
+            FETCH,
+            GRAD,
+            GATHER
+        };
+
+        ImmutableString name() const;
+
+        bool operator<(const TextureFunction &rhs) const;
+
+        const char *getReturnType() const;
+
+        TBasicType sampler;
+        int coords;
+        bool proj;
+        bool offset;
+        Method method;
+    };
+
+    // Returns the name of the texture function implementation to call.
+    // The name that's passed in is the name of the GLSL texture function that it should implement.
+    ImmutableString useTextureFunction(const ImmutableString &name,
+                                       TBasicType samplerType,
+                                       int coords,
+                                       size_t argumentCount,
+                                       bool lod0,
+                                       sh::GLenum shaderType);
+
+    void textureFunctionHeader(TInfoSinkBase &out,
+                               const ShShaderOutput outputType,
+                               bool getDimensionsIgnoresBaseLevel);
+
+  private:
+    typedef std::set<TextureFunction> TextureFunctionSet;
+    TextureFunctionSet mUsesTexture;
+};
+
+}  // namespace sh
+
+#endif  // COMPILER_TRANSLATOR_TEXTUREFUNCTIONHLSL_H_