Add tests for console messages of waitUntil() and respondWith()

This adds browser tests that verify console message logged when a
promise passed to waitUntil() or respondWith() is rejected.

These tests are here because console outputs from SWs aren't testable
with layout tests (crbug.com/456708).

BUG=359423

Review URL: https://codereview.chromium.org/1081953004

Cr-Commit-Position: refs/heads/master@{#325383}
3 files changed