Automate more parts of gn/package_ios.py.

We can determine the signing identity by running 'security',
and can find an installed mobile provisioning profile by
looking in the directory where they're installed.

Change-Id: Ia6a4579ef1918b5337cdf8745ac1e39743b38252
Reviewed-on: https://skia-review.googlesource.com/7798
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed