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diff --git a/gfx/angle/checkout/src/compiler/translator/tree_ops/RemoveInactiveInterfaceVariables.h b/gfx/angle/checkout/src/compiler/translator/tree_ops/RemoveInactiveInterfaceVariables.h
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index 0000000000..ddbdea2ced
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+++ b/gfx/angle/checkout/src/compiler/translator/tree_ops/RemoveInactiveInterfaceVariables.h
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+//
+// 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.
+//
+// RemoveInactiveInterfaceVariables.h:
+//  Drop shader interface variable declarations for those that are inactive.  This step needs to be
+//  done after CollectVariables.  This avoids having to emulate them (e.g. atomic counters for
+//  Vulkan) or remove them in glslang wrapper (again, for Vulkan).
+//
+//  Shouldn't be run for the GL backend, as it queries shader interface variables from GL itself,
+//  instead of relying on what was gathered during CollectVariables.
+//
+
+#ifndef COMPILER_TRANSLATOR_TREEOPS_REMOVEINACTIVEVARIABLES_H_
+#define COMPILER_TRANSLATOR_TREEOPS_REMOVEINACTIVEVARIABLES_H_
+
+#include "common/angleutils.h"
+
+namespace sh
+{
+
+struct InterfaceBlock;
+struct ShaderVariable;
+class TCompiler;
+class TIntermBlock;
+class TSymbolTable;
+
+[[nodiscard]] bool RemoveInactiveInterfaceVariables(
+    TCompiler *compiler,
+    TIntermBlock *root,
+    TSymbolTable *symbolTable,
+    const std::vector<sh::ShaderVariable> &attributes,
+    const std::vector<sh::ShaderVariable> &inputVaryings,
+    const std::vector<sh::ShaderVariable> &outputVariables,
+    const std::vector<sh::ShaderVariable> &uniforms,
+    const std::vector<sh::InterfaceBlock> &interfaceBlocks,
+    bool removeFragmentOutputs);
+
+}  // namespace sh
+
+#endif  // COMPILER_TRANSLATOR_TREEOPS_REMOVEINACTIVEVARIABLES_H_