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As discussed on the doc [1], adding a test_path_format option for correct
parsing of test paths. The testPath attribute is now mandatory, so
adding it to the test.

[1] https://docs.google.com/document/d/18PstJFR6kmEeDiQZjVzJaqXWm4SocuZXrFVu57xDm-4

Change-Id: Id988cd620da0927fab9fb42b81fd52855198f75c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899625
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712659}