Add to/from disk stable format

import com.android.internal.util.HexDump;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

        return result;

    }

    /**

     * Converts a PersistableBundle into a disk-stable byte array format

     *

     * @param bundle the PersistableBundle to be converted to a disk-stable format

     * @return the byte array representation of the PersistableBundle

     */

    @Nullable

    public static byte[] toDiskStableBytes(@NonNull PersistableBundle bundle) throws IOException {

        final ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        bundle.writeToStream(outputStream);

        return outputStream.toByteArray();

    }

    /**

     * Converts from a disk-stable byte array format to a PersistableBundle

     *

     * @param bytes the disk-stable byte array

     * @return the PersistableBundle parsed from this byte array.

     */

    public static PersistableBundle fromDiskStableBytes(@NonNull byte[] bytes) throws IOException {

        final ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);

        return PersistableBundle.readFromStream(inputStream);

    }

    /**

     * Ensures safe reading and writing of {@link PersistableBundle}s to and from disk.

     *

        assertTrue(PersistableBundleUtils.isEqual(testBundle, minimized));

    }

    @Test

    public void testToFromDiskStableBytes() throws Exception {

        final PersistableBundle testBundle = getTestBundle();

        final PersistableBundle result =

                PersistableBundleUtils.fromDiskStableBytes(

                        PersistableBundleUtils.toDiskStableBytes(testBundle));

        assertTrue(PersistableBundleUtils.isEqual(testBundle, result));

    }

    @Test

    public void testEquality_identical() throws Exception {

        final PersistableBundle left = getTestBundle();