Merge "Fix assertion error in picker initialization." into nyc-andromeda-dev

import com.android.documentsui.dirlist.FragmentTuner;

import com.android.documentsui.dirlist.Model;

import com.android.documentsui.dirlist.Model.Update;

import com.android.documentsui.dirlist.MultiSelectManager;

import javax.annotation.Nullable;

    private static final class Config {

        @Nullable Model model;

        @Nullable MultiSelectManager selectionMgr;

        boolean searchMode;

        private final EventListener<Update> mModelUpdateListener;

        private boolean modelLoadObserved;

        public void reset(Model model, boolean searchMode) {

            this.searchMode = searchMode;

            assert(model != null);

            assert(selectionMgr != null);

            this.searchMode = searchMode;

            this.model = model;

            this.selectionMgr = selectionMgr;

            model.addUpdateListener(mModelUpdateListener);

            modelLoadObserved = false;