Blink-compatible serialization of arrays, both dense and sparse.

src/value-serializer.h

Index: src/value-serializer.h
diff --git a/src/value-serializer.h b/src/value-serializer.h
index efb5a9675393ddc0f5dbb026f356e395ff59a9e9..8de7d56920cd9e1607a4af196e2893cb45abfcf4 100644
--- a/src/value-serializer.h
+++ b/src/value-serializer.h
@@ -72,6 +72,7 @@ class ValueSerializer {
   void WriteString(Handle<String> string);
   Maybe<bool> WriteJSReceiver(Handle<JSReceiver> receiver) WARN_UNUSED_RESULT;
   Maybe<bool> WriteJSObject(Handle<JSObject> object) WARN_UNUSED_RESULT;
+  Maybe<bool> WriteJSArray(Handle<JSArray> array) WARN_UNUSED_RESULT;
 
   /*
    * Reads the specified keys from the object and writes key-value pairs to the
@@ -140,6 +141,8 @@ class ValueDeserializer {
   MaybeHandle<String> ReadUtf8String() WARN_UNUSED_RESULT;
   MaybeHandle<String> ReadTwoByteString() WARN_UNUSED_RESULT;
   MaybeHandle<JSObject> ReadJSObject() WARN_UNUSED_RESULT;
+  MaybeHandle<JSArray> ReadSparseJSArray() WARN_UNUSED_RESULT;
+  MaybeHandle<JSArray> ReadDenseJSArray() WARN_UNUSED_RESULT;
 
   /*
    * Reads key-value pairs into the object until the specified end tag is