Add handleActiveSource() to update atom local active source.

        }

    }

    @ServiceThreadOnly

    protected boolean handleActiveSource(HdmiCecMessage message) {

        assertRunOnServiceThread();

        int logicalAddress = message.getSource();

        int physicalAddress = HdmiUtils.twoBytesToInt(message.getParams());

        ActiveSource activeSource = ActiveSource.of(logicalAddress, physicalAddress);

        if (!mActiveSource.equals(activeSource)) {

            setActiveSource(activeSource);

        }

        return true;

    }

    @Override

    @ServiceThreadOnly

    protected int getPreferredAddress() {

import android.os.test.TestLooper;

import android.support.test.filters.SmallTest;

import com.android.server.hdmi.HdmiCecLocalDevice.ActiveSource;

import java.util.ArrayList;

import org.junit.Before;

import org.junit.Test;

        assertThat(mHdmiCecLocalDeviceAudioSystem

            .getActions(SystemAudioInitiationActionFromAvr.class)).isNotEmpty();

    }

    @Test

    public void handleActiveSource_updateActiveSource() {

        HdmiCecMessage message = HdmiCecMessageBuilder

            .buildActiveSource(ADDR_TV, 0x0000);

        ActiveSource expectedActiveSource = new ActiveSource(ADDR_TV, 0x0000);

        assertTrue(mHdmiCecLocalDeviceAudioSystem.handleActiveSource(message));

        mTestLooper.dispatchAll();

        assertTrue(mHdmiCecLocalDeviceAudioSystem.getActiveSource().equals(expectedActiveSource));

    }

}