Keep materialized ArrayBuffer and ImageBitmap objects in SerializedScriptValue.

third_party/WebKit/Source/platform/wtf/Optional.h

Index: third_party/WebKit/Source/platform/wtf/Optional.h
diff --git a/third_party/WebKit/Source/platform/wtf/Optional.h b/third_party/WebKit/Source/platform/wtf/Optional.h
index d1a12583aaad42ff088d549bd6b5ebac292ead59..9c869257851a33d5f4c4c993f2d943f226b2db39 100644
--- a/third_party/WebKit/Source/platform/wtf/Optional.h
+++ b/third_party/WebKit/Source/platform/wtf/Optional.h
@@ -16,8 +16,10 @@ namespace WTF {
 // outside of the heap, similarly we enforce that one doesn't create garbage
 // collected types nested inside an Optional.
 template <typename T>
-using Optional = typename std::enable_if<!IsGarbageCollectedType<T>::value,
-                                         base::Optional<T>>::type;
+using Optional =
+    typename std::enable_if<!IsGarbageCollectedType<T>::value ||
+                                IsPersistentReferenceType<T>::value,
+                            base::Optional<T>>::type;
 
 constexpr base::nullopt_t kNullopt = base::nullopt;
 constexpr base::in_place_t in_place = base::in_place;