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Summary of changes:
1. Fails QUnit.test() it doesn't return within 5 seconds.
   Timing dependent tests should use fake timers instead.
2. Adds an option to disable the timeout when debugging failed tests
   locally.
3. Logs the current test to the console to ease debugging.

NOTRY=true

Trybots failing on tests that has already been deleted.

Review URL: https://codereview.chromium.org/1638753003

Cr-Commit-Position: refs/heads/master@{#371890}