Add Shipped field to libunwindstack README.chromium

Bug: 365320791
Change-Id: I02566f39f3378f7e521f9b6e74190549f46614e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/third_party/libunwindstack/+/6143093
Reviewed-by: Rodney Ding <rodneyding@google.com>
1 file changed