Merge "Add nullability annotations."

  public class CarrierMessagingClientService extends android.app.Service {

    ctor public CarrierMessagingClientService();

    method public final android.os.IBinder onBind(android.content.Intent);

    method @NonNull public final android.os.IBinder onBind(@Nullable android.content.Intent);

  }

  public abstract class CarrierMessagingService extends android.app.Service {

 */

package android.service.carrier;

import android.annotation.NonNull;

import android.annotation.Nullable;

import android.app.Service;

import android.content.ComponentName;

import android.content.Intent;

    }

    @Override

    public final IBinder onBind(Intent intent) {

    @NonNull

    public final IBinder onBind(@Nullable Intent intent) {

        return mImpl.asBinder();

    }