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This CL adds Ozone platform initialisation to the user input monitor tests
so they can now work with Ozone enabled.

Bug: 1109112
Change-Id: I31f9dabf2da9eed85cd05fe27017899b0247f4bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521144
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826638}