bindings: Support "attribute FrozenArray<T>?"

Adds a quick hack to support a case of "attribute FrozenArray<T>?".

Bug: 1028047
Change-Id: Ib3cecc4beb6bcc0fb0dbc667aca595454cc90c86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933866
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718676}
bool V8TestObject::HasInstance(v8::Local<v8::Value> v8_value, v8::Isolate* isolate) {
  return V8PerIsolateData::From(isolate)->HasInstance(V8TestObject::GetWrapperTypeInfo(), v8_value);
}

bool V8TestObject::HasInstance(v8::Local<v8::Value> v8_value, v8::Isolate* isolate) {
  return V8PerIsolateData::From(isolate)->HasInstance(V8TestObject::GetWrapperTypeInfo(), v8_value);
}
