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Add browser tests for UKM plus Sync-standalone-transport

This are the tests corresponding to https://crrev.com/c/1343369

Bug: 906609
Change-Id: Ib57c12b77cba6242292edb34750a756e1c191341
Reviewed-on: https://chromium-review.googlesource.com/c/1348063
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610451}