Merge "Fix LicenseHtmlGeneratorFromXml miss files header" am: 0239107ed5 am: 1a480d9759 am: c094181aa0

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2005491

Change-Id: Ic83aed5fa5a9ce1aebf9ffc709a36f0338a6fd9f