1 files changed, 25 insertions, 6 deletions
diff --git a/chromium/third_party/blink/renderer/core/streams/transferable_streams.h b/chromium/third_party/blink/renderer/core/streams/transferable_streams.h
index 3c75195255e..dbace5ce634 100644
--- a/chromium/third_party/blink/renderer/core/streams/transferable_streams.h
+++ b/chromium/third_party/blink/renderer/core/streams/transferable_streams.h
@@ -7,6 +7,8 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFERABLE_STREAMS_H_
 #define THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TRANSFERABLE_STREAMS_H_
 
+#include <memory>
+
 #include "third_party/blink/renderer/core/core_export.h"
 
 namespace blink {
@@ -14,25 +16,42 @@ namespace blink {
 class ExceptionState;
 class MessagePort;
 class ReadableStream;
+class ReadableStreamTransferringOptimizer;
 class ScriptState;
+class UnderlyingSourceBase;
 class WritableStream;
+class WritableStreamTransferringOptimizer;
 
 // 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().
 // Equivalent to SetUpCrossRealmTransformWritable in the standard:
 // https://streams.spec.whatwg.org/#abstract-opdef-setupcrossrealmtransformwritable
-CORE_EXPORT WritableStream* CreateCrossRealmTransformWritable(ScriptState*,
-                                                              MessagePort* port,
-                                                              ExceptionState&);
+CORE_EXPORT WritableStream* CreateCrossRealmTransformWritable(
+    ScriptState*,
+    MessagePort* port,
+    std::unique_ptr<WritableStreamTransferringOptimizer> optimizer,
+    ExceptionState&);
 
 // Creates the readable side of a cross-realm identity transform stream. |port|
 // is used symmetrically with CreateCrossRealmTransformWritable().
 // Equivalent to SetUpCrossRealmTransformReadable in the standard:
 // https://streams.spec.whatwg.org/#abstract-opdef-setupcrossrealmtransformreadable
-CORE_EXPORT ReadableStream* CreateCrossRealmTransformReadable(ScriptState*,
-                                                              MessagePort* port,
-                                                              ExceptionState&);
+CORE_EXPORT ReadableStream* CreateCrossRealmTransformReadable(
+    ScriptState*,
+    MessagePort* port,
+    std::unique_ptr<ReadableStreamTransferringOptimizer> optimizer,
+    ExceptionState&);
+
+// Creates a ReadableStream that is identical to the concatenation of
+// a ReadableStream created with `source1` and a ReadableStream created with
+// `source2`.
+// The implementation is optimized with an assumption that `source2` is (much)
+// longer than `source1`.
+CORE_EXPORT ReadableStream* CreateConcatenatedReadableStream(
+    ScriptState*,
+    UnderlyingSourceBase* source1,
+    UnderlyingSourceBase* source2);
 
 }  // namespace blink