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diff --git a/src/sksl/ast/SkSLASTModifiers.h b/src/sksl/ast/SkSLASTModifiers.h
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+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SKSL_ASTMODIFIERS
+#define SKSL_ASTMODIFIERS
+
+#include "SkSLASTLayout.h"
+#include "SkSLASTNode.h"
+
+namespace SkSL {
+
+/**
+ * A set of modifier keywords (in, out, uniform, etc.) appearing before a declaration.
+ */
+struct ASTModifiers : public ASTNode {
+ enum Flag {
+ kNo_Flag = 0,
+ kConst_Flag = 1,
+ kIn_Flag = 2,
+ kOut_Flag = 4,
+ kLowp_Flag = 8,
+ kMediump_Flag = 16,
+ kHighp_Flag = 32,
+ kUniform_Flag = 64
+ };
+
+ ASTModifiers(ASTLayout layout, int flags)
+ : fLayout(layout)
+ , fFlags(flags) {}
+
+ std::string description() const override {
+ std::string result = fLayout.description();
+ if (fFlags & kUniform_Flag) {
+ result += "uniform ";
+ }
+ if (fFlags & kConst_Flag) {
+ result += "const ";
+ }
+ if (fFlags & kLowp_Flag) {
+ result += "lowp ";
+ }
+ if (fFlags & kMediump_Flag) {
+ result += "mediump ";
+ }
+ if (fFlags & kHighp_Flag) {
+ result += "highp ";
+ }
+
+ if ((fFlags & kIn_Flag) && (fFlags & kOut_Flag)) {
+ result += "inout ";
+ } else if (fFlags & kIn_Flag) {
+ result += "in ";
+ } else if (fFlags & kOut_Flag) {
+ result += "out ";
+ }
+
+ return result;
+ }
+
+ const ASTLayout fLayout;
+ const int fFlags;
+};
+
+} // namespace
+
+#endif