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These tests were previously disabled as flaky(they were timeouting on
the app launching step). The app launch logic was completely reworked
recently, which could mean that these test will work well.

Also, this cl makes window creation log message more visible, which
should ease debug of such timeouts.

Bug: 949490
Change-Id: I912d2d71cf12410b26688496dea306964e5b54bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359030Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799128}