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diff --git a/gfx/angle/checkout/src/compiler/translator/blocklayoutHLSL.h b/gfx/angle/checkout/src/compiler/translator/blocklayoutHLSL.h
new file mode 100644
index 0000000000..8ed46b7728
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+++ b/gfx/angle/checkout/src/compiler/translator/blocklayoutHLSL.h
@@ -0,0 +1,68 @@
+//
+// Copyright 2013 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.
+//
+// blocklayout.h:
+//   Methods and classes related to uniform layout and packing in GLSL and HLSL.
+//
+
+#ifndef COMMON_BLOCKLAYOUTHLSL_H_
+#define COMMON_BLOCKLAYOUTHLSL_H_
+
+#include <cstddef>
+#include <vector>
+
+#include <GLSLANG/ShaderLang.h>
+#include "angle_gl.h"
+#include "blocklayout.h"
+
+namespace sh
+{
+// Block layout packed according to the D3D9 or default D3D10+ register packing rules
+// See http://msdn.microsoft.com/en-us/library/windows/desktop/bb509632(v=vs.85).aspx
+// The strategy should be ENCODE_LOOSE for D3D9 constant blocks, and ENCODE_PACKED
+// for everything else (D3D10+ constant blocks and all attributes/varyings).
+
+class HLSLBlockEncoder : public BlockLayoutEncoder
+{
+  public:
+    enum HLSLBlockEncoderStrategy
+    {
+        ENCODE_PACKED,
+        ENCODE_LOOSE
+    };
+
+    HLSLBlockEncoder(HLSLBlockEncoderStrategy strategy, bool transposeMatrices);
+
+    void enterAggregateType(const ShaderVariable &structVar) override;
+    void exitAggregateType(const ShaderVariable &structVar) override;
+    void skipRegisters(unsigned int numRegisters);
+
+    bool isPacked() const { return mEncoderStrategy == ENCODE_PACKED; }
+
+    static HLSLBlockEncoderStrategy GetStrategyFor(ShShaderOutput outputType);
+
+  protected:
+    void getBlockLayoutInfo(GLenum type,
+                            const std::vector<unsigned int> &arraySizes,
+                            bool isRowMajorMatrix,
+                            int *arrayStrideOut,
+                            int *matrixStrideOut) override;
+    void advanceOffset(GLenum type,
+                       const std::vector<unsigned int> &arraySizes,
+                       bool isRowMajorMatrix,
+                       int arrayStride,
+                       int matrixStride) override;
+
+    HLSLBlockEncoderStrategy mEncoderStrategy;
+    bool mTransposeMatrices;
+};
+
+// This method returns the number of used registers for a ShaderVariable. It is dependent on the
+// HLSLBlockEncoder class to count the number of used registers in a struct (which are individually
+// packed according to the same rules).
+unsigned int HLSLVariableRegisterCount(const ShaderVariable &variable, ShShaderOutput outputType);
+}  // namespace sh
+
+#endif  // COMMON_BLOCKLAYOUTHLSL_H_