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Many places in test code call EXPECT_TRUE(VerifyUi()), which only
produces a stack trace and does not tell you which of the conditions in
VerifyUi() aren't met. Adding logging allows us to look at the test logs
and figure out which condition actually failed.

Change-Id: If6f81dac0f10aabdf8125571295f2a55343f93ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949452
Auto-Submit: Dana Fried <dfried@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721528}