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This CL adds a script to download a number of test doodle configs from
the ddljson API. It also adds a captured snapshot of those configs, and
a test that they all get parsed without errors.

Bug: 690467
Change-Id: Idf8375a4199fc129b905c7f8cd32f12d071389e9
Reviewed-on: https://chromium-review.googlesource.com/597647
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491731}