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}
void V8TestObject::HighEntropyConstantConstantGetterCallback(v8::Local<v8::Name>, const v8::PropertyCallbackInfo<v8::Value>& info) {
  RUNTIME_CALL_TIMER_SCOPE_DISABLED_BY_DEFAULT(info.GetIsolate(), "Blink_TestObject_highEntropyConstant_ConstantGetter");

  ExecutionContext* execution_context_for_measurement = CurrentExecutionContext(info.GetIsolate());
  UseCounter::Count(execution_context_for_measurement, WebFeature::kTestFeatureHighEntropyConstant);
  Dactyloscoper::Record(execution_context_for_measurement, WebFeature::kTestFeatureHighEntropyConstant);
  V8SetReturnValueString(info, "1");
}

void V8TestObject::HighEntropyConstantConstantGetterCallback(v8::Local<v8::Name>, const v8::PropertyCallbackInfo<v8::Value>& info) {
  RUNTIME_CALL_TIMER_SCOPE_DISABLED_BY_DEFAULT(info.GetIsolate(), "Blink_TestObject_highEntropyConstant_ConstantGetter");

  ExecutionContext* execution_context_for_measurement = CurrentExecutionContext(info.GetIsolate());
  UseCounter::Count(execution_context_for_measurement, WebFeature::kTestFeatureHighEntropyConstant);
  Dactyloscoper::Record(execution_context_for_measurement, WebFeature::kTestFeatureHighEntropyConstant);
  V8SetReturnValueString(info, "1");
}
