[WCT] Mocha slow api is ineffective

[dman777]

From https://mochajs.org/

describe('something slow', function() {
  this.slow(10000);

  it('should take long enough for me to go make a sandwich', function() {
    // ...
  });
});

This is ineffective in

% polymer test --version
1.7.0-pre.17

Nothing slows down

[stale]

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[stale]

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