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diff --git a/security/sandbox/chromium/sandbox/win/src/heap_helper.h b/security/sandbox/chromium/sandbox/win/src/heap_helper.h
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+++ b/security/sandbox/chromium/sandbox/win/src/heap_helper.h
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+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SANDBOX_WIN_SRC_HEAP_HELPER_H_
+#define SANDBOX_WIN_SRC_HEAP_HELPER_H_
+
+#include <windows.h>
+
+#include "base/win/windows_version.h"
+
+namespace sandbox {
+// These helper functions are not expected to be used generally, but are exposed
+// only to allow direct testing of this functionality.
+
+// Return the flags for this heap handle. Limited verification of the handle is
+// performed. No verification of the flags is performed.
+bool HeapFlags(HANDLE handle, DWORD* flags);
+
+// Return the handle to the CSR Port Heap, return nullptr if none or more than
+// one candidate was found.
+HANDLE FindCsrPortHeap();
+
+} // namespace sandbox
+
+#endif // SANDBOX_WIN_SRC_HEAP_HELPER_H_