Merge cherrypicks of [8662136, 8662137, 8660337, 8660601, 8660073, 8660074,...

# See the License for the specific language governing permissions and

# limitations under the License.

rm -rf /sdcard/Android/obb/test_probe

mkdir -p /sdcard/Android/obb/

touch /sdcard/Android/obb/test_probe

if ! test -f /data/media/0/Android/obb/test_probe ; then

  log -p i -t migrate_legacy_obb_data "No support for 'unshared_obb'. Not migrating"

  rm -rf /sdcard/Android/obb/test_probe

  exit 0

fi

# Delete the test file, and remove the obb folder if it is empty

rm -rf /sdcard/Android/obb/test_probe

rmdir /data/media/obb

if ! test -d /data/media/obb ; then

  log -p i -t migrate_legacy_obb_data "No legacy obb data to migrate."

  exit 0