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Added sync after some ChromeEarlGrey operations where a UI change in
app might be triggered. This should eliminate undesirable racing
conditions before UI change finishes at app. TabUsageRecorderTestCase
is an example and this CL fixes it.

Bug: 1034196, 1033879
Change-Id: Ib260414371b832eed517d8bf72b2ee0c10f5cfd7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1970914
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726550}