Isolate* isolate, Handle<EmbedderDataArray> array, int index) {

if (index < array->length()) return array;

DCHECK_LT(index, kMaxLength);

Handle<EmbedderDataArray> new_array =

isolate->factory()->NewEmbedderDataArray(index + 1);

DisallowGarbageCollection no_gc;

// Last new space allocation does not require any write barriers.

size_t size = array->length() * kEmbedderDataSlotSize;

MemCopy(reinterpret_cast<void*>(new_array->slots_start()),

reinterpret_cast<void*>(array->slots_start()), size);

return new_array;