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Tests checking for eroro message buble can be flaky, because on-screen message
can disappear before test checks for it. This CL adds special flag for tests.

BUG=339348

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=268924

Review URL: https://codereview.chromium.org/268373002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269773 0039d316-1c4b-4281-b951-d872f2087c98