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diff --git a/gfx/angle/checkout/src/compiler/translator/tree_ops/RewriteCubeMapSamplersAs2DArray.h b/gfx/angle/checkout/src/compiler/translator/tree_ops/RewriteCubeMapSamplersAs2DArray.h
new file mode 100644
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+++ b/gfx/angle/checkout/src/compiler/translator/tree_ops/RewriteCubeMapSamplersAs2DArray.h
@@ -0,0 +1,29 @@
+//
+// Copyright 2019 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.
+//
+// RewriteCubeMapSamplersAs2DArray: Change samplerCube samplers to sampler2DArray, and the
+// textureCube* function calls to calls to helper functions that select the cube map face and sample
+// from the face as a 2D texture.  This emulates seamful cube map sampling in ES2 (or desktop GL 2)
+// and therefore only looks at samplerCube (i.e. not integer variants or cube arrays) and sampling
+// functions that are defined in ES GLSL 1.0 (i.e. not the cube overload of texture()).
+
+#ifndef COMPILER_TRANSLATOR_TREEOPS_REWRITECUBEMAPSAMPLERSAS2DARRAY_H_
+#define COMPILER_TRANSLATOR_TREEOPS_REWRITECUBEMAPSAMPLERSAS2DARRAY_H_
+
+#include "common/angleutils.h"
+
+namespace sh
+{
+class TCompiler;
+class TIntermBlock;
+class TSymbolTable;
+
+[[nodiscard]] bool RewriteCubeMapSamplersAs2DArray(TCompiler *compiler,
+                                                   TIntermBlock *root,
+                                                   TSymbolTable *symbolTable,
+                                                   bool isFragmentShader);
+}  // namespace sh
+
+#endif  // COMPILER_TRANSLATOR_TREEOPS_REWRITECUBEMAPSAMPLERSAS2DARRAY_H_