NetworkTimeUpdateService: Grab a wakelock when manipulating system time

import android.os.Looper;

import android.os.Message;

import android.os.SystemClock;

import android.os.PowerManager;

import android.provider.Settings;

import android.util.Log;

import android.util.NtpTrustedTime;

    private SettingsObserver mSettingsObserver;

    // The last time that we successfully fetched the NTP time.

    private long mLastNtpFetchTime = NOT_SET;

    private final PowerManager.WakeLock mWakeLock;

    // Normal polling frequency

    private final long mPollingIntervalMs;

                com.android.internal.R.integer.config_ntpRetry);

        mTimeErrorThresholdMs = mContext.getResources().getInteger(

                com.android.internal.R.integer.config_ntpThreshold);

        mWakeLock = ((PowerManager) context.getSystemService(Context.POWER_SERVICE)).newWakeLock(

                PowerManager.PARTIAL_WAKE_LOCK, TAG);

    }

    /** Initialize the receivers and initiate the first NTP request */

    private void onPollNetworkTime(int event) {

        // If Automatic time is not set, don't bother.

        if (!isAutomaticTimeRequested()) return;

        mWakeLock.acquire();

        try {

            onPollNetworkTimeUnderWakeLock(event);

        } finally {

            mWakeLock.release();

        }

    }

    private void onPollNetworkTimeUnderWakeLock(int event) {

        final long refTime = SystemClock.elapsedRealtime();

        // If NITZ time was received less than mPollingIntervalMs time ago,

        // no need to sync to NTP.