Merge "Add initial unit tests for HdmiCecMessageValidator" am: 95d5d13bb5 am: 005dec645b am: 5b25b120c5 am: cf9a6dce7d

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1452497

Change-Id: I3ec3b91f5b2f08a95b07a113a4e40e372fcf5efd