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This CL adds a fixture that can be used for integration tests when deep
scanning downloads. Future CLs will use this fixture for testing the
core user journeys in download deep scanning.

Bug: 1060367
Change-Id: I1aea7d4821e9abe6230038419de7061bee88e5a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2117294Reviewed-by: Xinghui Lu <xinghuilu@chromium.org>
Reviewed-by: Dominique Fauteux-Chapleau <domfc@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753742}