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The downstream iOS bots import a gn file from $root_build_dir/args.gn
that contains nested scopes. Support to parse the file has been added
to //build/gn_helpers.py with https://crrev.com/c/2513217.

The next step on the bot is pretty printing the data parsed, which
fails as nested scopes are converted to nested dictionaries. This
CL adds support to pretty print those.

Bug: 1144711
Change-Id: I3130d493c6385f2016d91245e8a5f12e710495cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517679
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823627}