Merge "Enable the copy feature."

import android.os.CancellationSignal;

import android.os.OperationCanceledException;

import android.os.Parcelable;

import android.os.SystemProperties;

import android.provider.DocumentsContract;

import android.provider.DocumentsContract.Document;

import android.text.format.DateUtils;

            open.setVisible(!manageOrBrowse);

            share.setVisible(manageOrBrowse);

            delete.setVisible(manageOrBrowse);

            // TODO: unhide copying when ready

            copy.setVisible(manageOrBrowse &&

                    SystemProperties.getBoolean("debug.documentsui.enable_copy", false));

            copy.setVisible(manageOrBrowse);

            return true;

        }