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These tests needed some extra synchronization due to the changes made in
http://crrev.com/c/1139048. These were flaking in component builds.

Bug: 871224
Change-Id: Ibe370f9b9c8ebb94ee1dd21ba204c06e91518057
Reviewed-on: https://chromium-review.googlesource.com/1163987
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580980}