ValueSerializer: Support efficiently reading and writing one-byte strings.

src/value-serializer.h

Index: src/value-serializer.h
diff --git a/src/value-serializer.h b/src/value-serializer.h
index d300e39aa715035519c28e779867538602fa9f45..c2f67030e0872aa1561887e9fdf64ec4195b81d3 100644
--- a/src/value-serializer.h
+++ b/src/value-serializer.h
@@ -232,6 +232,7 @@ class ValueDeserializer {
   // Reading V8 objects of specific kinds.
   // The tag is assumed to have already been read.
   MaybeHandle<String> ReadUtf8String() WARN_UNUSED_RESULT;
+  MaybeHandle<String> ReadOneByteString() WARN_UNUSED_RESULT;
   MaybeHandle<String> ReadTwoByteString() WARN_UNUSED_RESULT;
   MaybeHandle<JSObject> ReadJSObject() WARN_UNUSED_RESULT;
   MaybeHandle<JSArray> ReadSparseJSArray() WARN_UNUSED_RESULT;