Merge "Move retention length of users' chooser selections to SystemProperties,...

import android.app.usage.UsageStats;

import android.app.usage.UsageStatsManager;

import android.os.Build;

import android.os.SystemProperties;

import android.util.AtomicFile;

import android.util.Slog;

import android.util.TimeUtils;

    private static final boolean DEBUG = UsageStatsService.DEBUG;

    private static final String BAK_SUFFIX = ".bak";

    private static final String CHECKED_IN_SUFFIX = UsageStatsXml.CHECKED_IN_SUFFIX;

    private static final String RETENTION_LEN_KEY = "ro.usagestats.chooser.retention";

    private static final int SELECTION_LOG_RETENTION_LEN =

            SystemProperties.getInt(RETENTION_LEN_KEY, 14);

    private final Object mLock = new Object();

    private final File[] mIntervalDirs;

                    mCal.getTimeInMillis());

            mCal.setTimeInMillis(currentTimeMillis);

            mCal.addDays(-14);

            mCal.addDays(-SELECTION_LOG_RETENTION_LEN);

            for (int i = 0; i < mIntervalDirs.length; ++i) {

                pruneChooserCountsOlderThan(mIntervalDirs[i], mCal.getTimeInMillis());

            }