Cant import android HDMI package even though it is in master

Question

I am trying to use HdmiCecMessage class in my android app, so I installed this dependency in my gradlef file:

dependencies {
    implementation 'androidx.hardware:hardware-hdmi:1.0.0'
}

but when I try to import:

import android.hardware.hdmi.HdmiCecMessage;

I get an error I get an error "cannot find symbol HdmiCecMessage". I saw in google open source that it exsists: https://android.googlesource.com/platform/frameworks/base/+/9302a73/core/java/android/hardware/hdmi/

any ideas? thanks