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diff --git a/gfx/angle/checkout/src/compiler/translator/tree_ops/DeclareAndInitBuiltinsForInstancedMultiview.h b/gfx/angle/checkout/src/compiler/translator/tree_ops/DeclareAndInitBuiltinsForInstancedMultiview.h
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+++ b/gfx/angle/checkout/src/compiler/translator/tree_ops/DeclareAndInitBuiltinsForInstancedMultiview.h
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+//
+// Copyright 2017 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.
+//
+// Regardless of the shader type, the following AST transformations are applied:
+// - Add declaration of View_ID_OVR.
+// - Replace every occurrence of gl_ViewID_OVR with ViewID_OVR, mark ViewID_OVR as internal and
+// declare it as a flat varying.
+//
+// If the shader type is a vertex shader, the following AST transformations are applied:
+// - Replace every occurrence of gl_InstanceID with InstanceID, mark InstanceID as internal and set
+// its qualifier to EvqTemporary.
+// - Add initializers of ViewID_OVR and InstanceID to the beginning of the body of main. The pass
+// should be executed before any variables get collected so that usage of gl_InstanceID is recorded.
+// - If the output is ESSL or GLSL and the selectViewInNvGLSLVertexShader option is
+// enabled, the expression
+// "if (multiviewBaseViewLayerIndex < 0) {
+//      gl_ViewportIndex = int(ViewID_OVR);
+//  } else {
+//      gl_Layer = int(ViewID_OVR) + multiviewBaseViewLayerIndex;
+//  }"
+// is added after ViewID and InstanceID are initialized. Also, MultiviewRenderPath is added as a
+// uniform.
+//
+
+#ifndef COMPILER_TRANSLATOR_TREEOPS_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_
+#define COMPILER_TRANSLATOR_TREEOPS_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_
+
+#include "GLSLANG/ShaderLang.h"
+#include "angle_gl.h"
+#include "common/angleutils.h"
+
+namespace sh
+{
+
+class TCompiler;
+class TIntermBlock;
+class TSymbolTable;
+
+[[nodiscard]] bool DeclareAndInitBuiltinsForInstancedMultiview(
+    TCompiler *compiler,
+    TIntermBlock *root,
+    unsigned numberOfViews,
+    GLenum shaderType,
+    const ShCompileOptions &compileOptions,
+    ShShaderOutput shaderOutput,
+    TSymbolTable *symbolTable);
+
+}  // namespace sh
+
+#endif  // COMPILER_TRANSLATOR_TREEOPS_DECLAREANDINITBUILTINSFORINSTANCEDMULTIVIEW_H_