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Before this patch, three different activity types were tested in the
same test. That resulted in the activities to interfere with one
another. This patch splits the tests up into one test file per
activity.

R=szermatt@chromium.org

Bug: 1018183
Change-Id: Ie09202e9ac69e96ac207ffe3f43b4e00e592d343
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910088Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714497}