Merge "Persist screen brightness setting through upgrade"

        mContext = context;

        mBrightnessSyncObserver = new BrightnessSyncObserver(mHandler);

        mBrightnessSyncObserver.startObserving();

        // It is possible for the system to start up with the int and float values not

        // synchronized. So we force an update to the int value, since float is the source

        // of truth. Fallback to int value, if float is invalid. If both are invalid, use default

        // float value from config.

        final float currentFloatBrightness = getScreenBrightnessFloat(context);

        final int currentIntBrightness = getScreenBrightnessInt(context);

        if (!Float.isNaN(currentFloatBrightness)) {

            updateBrightnessIntFromFloat(currentFloatBrightness);

        } else if (currentIntBrightness != -1) {

            updateBrightnessFloatFromInt(currentIntBrightness);

        } else {

            final float defaultBrightness = mContext.getResources().getFloat(

                    com.android.internal.R.dimen.config_screenBrightnessSettingDefaultFloat);

            Settings.System.putFloatForUser(mContext.getContentResolver(),

                    Settings.System.SCREEN_BRIGHTNESS_FLOAT, defaultBrightness,

                    UserHandle.USER_CURRENT);

        }

    }

    /**

    private static int getScreenBrightnessInt(Context context) {

        return Settings.System.getIntForUser(context.getContentResolver(),

                Settings.System.SCREEN_BRIGHTNESS, 0, UserHandle.USER_CURRENT);

                Settings.System.SCREEN_BRIGHTNESS, PowerManager.BRIGHTNESS_INVALID,

                UserHandle.USER_CURRENT);

    }

    private float mPreferredSettingValue;