Merge cherrypicks of ['googleplex-android-review.googlesource.com/28470427'] into 24Q4-release.

import com.android.systemui.util.concurrency.DelayableExecutor;

import com.android.systemui.util.concurrency.Execution;

import java.util.ArrayList;

import java.util.List;

import java.util.Set;

import java.util.concurrent.CopyOnWriteArraySet;

import java.util.concurrent.atomic.AtomicBoolean;

import javax.inject.Inject;

    ThresholdSensor mSecondaryThresholdSensor;

    private final DelayableExecutor mDelayableExecutor;

    private final Execution mExecution;

    private final List<ThresholdSensor.Listener> mListeners = new ArrayList<>();

    private final Set<Listener> mListeners = new CopyOnWriteArraySet<>();

    private String mTag = null;

    @VisibleForTesting protected boolean mPaused;

    private ThresholdSensorEvent mLastPrimaryEvent;

    public void unregister(ThresholdSensor.Listener listener) {

        mExecution.assertIsMainThread();

        mListeners.remove(listener);

        if (mListeners.size() == 0) {

        if (mListeners.isEmpty()) {

            unregisterInternal();

        }

    }

        }

        if (mLastEvent != null) {

            ThresholdSensorEvent lastEvent = mLastEvent;  // Listeners can null out mLastEvent.

            List<ThresholdSensor.Listener> listeners = new ArrayList<>(mListeners);

            listeners.forEach(proximitySensorListener ->

            mListeners.forEach(proximitySensorListener ->

                    proximitySensorListener.onThresholdCrossed(lastEvent));

        }