Attach (recommended) or Link to PDF file here:
https://drive.google.com/open?id=1UjLxnFw2g3gn3tvNLRYLdmG6mFdFKCcr

Configuration:
- Web browser and its version: Chrome 77.0.3865.90
- Operating system and its version: Mac mojave 10.14.6
- PDF.js version: 2.3.194
- Is a browser extension: Nope

Steps to reproduce the problem:
1. Make sure to set `renderInteractiveForms` to `true`
2. The read-only form field(Sample title) doesn't honor it's proper font-size

What is the expected behavior?
<img width="862" alt="write" src="https://user-images.githubusercontent.com/4616548/66152094-4a009a80-e64b-11e9-81dc-178068055efa.png">

What went wrong?
<img width="842" alt="wrong" src="https://user-images.githubusercontent.com/4616548/66152100-4d942180-e64b-11e9-91a8-ad9caf451f98.png">


}
      let appearance;
      if (value) {
        appearance = this.checkedAppearance;
      } else {
        appearance = this.uncheckedAppearance;
      }
      if (appearance) {
        const savedAppearance = this.appearance;
        this.appearance = appearance;
        const operatorList = super.getOperatorList(
          evaluator,
          task,
          renderForms,
          annotationStorage
        );
        this.appearance = savedAppearance;
        return operatorList;
      }
      
      return Promise.resolve(new OperatorList());
    }
    return super.getOperatorList(
      evaluator,
      task,
      renderForms,
      annotationStorage
    );
  }
  async save(evaluator, task, annotationStorage) {