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diff --git a/platform/winrt/include/GLSLANG/ShaderVars.h b/platform/winrt/include/GLSLANG/ShaderVars.h
new file mode 100644
index 0000000000..03ddf956f1
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+++ b/platform/winrt/include/GLSLANG/ShaderVars.h
@@ -0,0 +1,128 @@
+//
+// Copyright (c) 2013-2014 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.
+//
+// ShaderVars.h:
+//  Types to represent GL variables (varyings, uniforms, etc)
+//
+
+#ifndef _COMPILER_INTERFACE_VARIABLES_
+#define _COMPILER_INTERFACE_VARIABLES_
+
+#include <string>
+#include <vector>
+#include <algorithm>
+
+// Assume ShaderLang.h is included before ShaderVars.h, for sh::GLenum
+
+namespace sh
+{
+
+// Varying interpolation qualifier, see section 4.3.9 of the ESSL 3.00.4 spec
+enum InterpolationType
+{
+    INTERPOLATION_SMOOTH,
+    INTERPOLATION_CENTROID,
+    INTERPOLATION_FLAT
+};
+
+// Uniform block layout qualifier, see section 4.3.8.3 of the ESSL 3.00.4 spec
+enum BlockLayoutType
+{
+    BLOCKLAYOUT_STANDARD,
+    BLOCKLAYOUT_PACKED,
+    BLOCKLAYOUT_SHARED
+};
+
+// Base class for all variables defined in shaders, including Varyings, Uniforms, etc
+// Note: we must override the copy constructor and assignment operator so we can
+// work around excessive GCC binary bloating:
+// See https://code.google.com/p/angleproject/issues/detail?id=697
+struct ShaderVariable
+{
+    ShaderVariable();
+    ShaderVariable(GLenum typeIn, unsigned int arraySizeIn);
+    ~ShaderVariable();
+    ShaderVariable(const ShaderVariable &other);
+    ShaderVariable &operator=(const ShaderVariable &other);
+
+    bool isArray() const { return arraySize > 0; }
+    unsigned int elementCount() const { return std::max(1u, arraySize); }
+
+    GLenum type;
+    GLenum precision;
+    std::string name;
+    std::string mappedName;
+    unsigned int arraySize;
+    bool staticUse;
+};
+
+struct Uniform : public ShaderVariable
+{
+    Uniform();
+    ~Uniform();
+    Uniform(const Uniform &other);
+    Uniform &operator=(const Uniform &other);
+
+    bool isStruct() const { return !fields.empty(); }
+
+    std::vector<Uniform> fields;
+};
+
+struct Attribute : public ShaderVariable
+{
+    Attribute();
+    ~Attribute();
+    Attribute(const Attribute &other);
+    Attribute &operator=(const Attribute &other);
+
+    int location;
+};
+
+struct InterfaceBlockField : public ShaderVariable
+{
+    InterfaceBlockField();
+    ~InterfaceBlockField();
+    InterfaceBlockField(const InterfaceBlockField &other);
+    InterfaceBlockField &operator=(const InterfaceBlockField &other);
+
+    bool isStruct() const { return !fields.empty(); }
+
+    bool isRowMajorMatrix;
+    std::vector<InterfaceBlockField> fields;
+};
+
+struct Varying : public ShaderVariable
+{
+    Varying();
+    ~Varying();
+    Varying(const Varying &other);
+    Varying &operator=(const Varying &other);
+
+    bool isStruct() const { return !fields.empty(); }
+
+    InterpolationType interpolation;
+    std::vector<Varying> fields;
+    std::string structName;
+};
+
+struct InterfaceBlock
+{
+    InterfaceBlock();
+    ~InterfaceBlock();
+    InterfaceBlock(const InterfaceBlock &other);
+    InterfaceBlock &operator=(const InterfaceBlock &other);
+
+    std::string name;
+    std::string mappedName;
+    unsigned int arraySize;
+    BlockLayoutType layout;
+    bool isRowMajorLayout;
+    bool staticUse;
+    std::vector<InterfaceBlockField> fields;
+};
+
+}
+
+#endif // _COMPILER_INTERFACE_VARIABLES_