Merge "Make SharedPreferencesBackupHelper wait for async SharedPreference writes" into gingerbread

package android.app.backup;

import android.app.QueuedWork;

import android.content.Context;

import android.content.SharedPreferences;

import android.os.ParcelFileDescriptor;

            ParcelFileDescriptor newState) {

        Context context = mContext;

        // If a SharedPreference has an outstanding write in flight,

        // wait for it to finish flushing to disk.

        QueuedWork.waitToFinish();

        // make filenames for the prefGroups

        String[] prefGroups = mPrefGroups;

        final int N = prefGroups.length;

        }

    }

}