Marked tests as Timeout to match actual behavior.
Marked tests as Timeout to match actual behavior.

The tests service/{vm_timeline_events_test,coverage_test}.dart were
marked in service.status as possible timeouts, because I received
buildbot failure email that they had timed out.

The CL https://codereview.chromium.org/1779173003 that I had landed
only added 3 new test files and changed the status files for them, so
it is my interpretation that the timeouts are unrelated to my changes.

Review URL: https://codereview.chromium.org/1783423002 .

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