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We "white list" some exceptions which user story runner can continue running
the rest of user stories even if they are raised during the test run.

Those exceptions are:
page_test.Failure
util.TimeoutException
exceptions.LoginException
exceptions.ProfilingException
page_action.PageActionNotSupported
exceptions.AppCrashException (except if this is thrown inside
shared_user_story_state.state.TearDownState(), which indicates a failure of
recovering the test state)

BUG=437735

Review URL: https://codereview.chromium.org/755323012

Cr-Commit-Position: refs/heads/master@{#308258}