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This is a reland of 4ed2234c

Original change's description:
> generate_wrapper targets for iOS' non-EG/EG2 tests, EG, and EG2 tests
>
> The existing iOS recipe utilizes an isolate template, and an
> isolated.gen.json file to fill the template in per test with
> config-variables and path-variables. This isolate template contains
> the command arguments to invoke the iOS test runner.
>
> To support the iOS recipe migration to the Chromium recipe, I use GN to
> generate a script per test target instead of the isolate template. The
> script is pre-baked with arguments to the test runner (run.py). The
> given Swarming task is expected to execute the test by invoking the
> generated script.
>
> Invoking the generated script requires changes to gn_isolate_map.pyl
> for each iOS test target, and thus, these changes are only additive.
>
> * "ios_test_runner_wrapper" template wraps the generate_wrapper target.
>  It bakes iOS specific arguments into the script, such that it can
>  launch run.py with the given args.
> * ios_eg2_test, ios_eg_test, and test templates have
>  been updated to utilize the ios_test_runner_wrapper for iOS targets.
> * mb.py to skip generated_directory check when writing isolates.
>  View crbug/ in comments.
>
> Change-Id: I941d37dfdff0bd1ead1baff70907a197fee3fe64
> Bug: 1055328,912681
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023748
> Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#745105}

Bug: 1055328, 912681
Change-Id: Ie7979979365b570369e6b6f750cc9f3006024564
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088345Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747797}