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diff --git a/chromium/third_party/blink/renderer/core/streams/transferable_streams.h b/chromium/third_party/blink/renderer/core/streams/transferable_streams.h
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+++ b/chromium/third_party/blink/renderer/core/streams/transferable_streams.h
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+// Copyright 2019 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.
+
+// Functions used to build transferable streams.
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFERABLE_STREAMS_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFERABLE_STREAMS_H_
+
+#include "third_party/blink/renderer/core/core_export.h"
+
+namespace blink {
+
+class ExceptionState;
+class MessagePort;
+class ReadableStreamNative;
+class ScriptState;
+class WritableStreamNative;
+
+// Creates the writable side of a cross-realm identity transform stream, using
+// |port| for communication. |port| must be entangled with another MessagePort
+// which is passed to CreateCrossRealmTransformReadable().
+CORE_EXPORT WritableStreamNative* CreateCrossRealmTransformWritable(
+    ScriptState*,
+    MessagePort* port,
+    ExceptionState&);
+
+// Creates the readable side of a cross-realm identity transform stream. |port|
+// is used symmetrically with CreateCrossRealmTransformWritable().
+CORE_EXPORT ReadableStreamNative* CreateCrossRealmTransformReadable(
+    ScriptState*,
+    MessagePort* port,
+    ExceptionState&);
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFERABLE_STREAMS_H_