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This adds integration tests for the new step progress bar.
It also adds disabling of animations.

Bug: b/158750294
Change-Id: I6c49d5768dbcc4ce57f5ce5c3801931ec9207744
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275440
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Luca Hunkeler <hluca@google.com>
Cr-Commit-Position: refs/heads/master@{#784030}