[IndexedDB-tests] Ignore window.onerror spew from some implementations (#1774)

Following normal propagation of IDBRequest error events and IDBTransaction abort events, Firefox fires global error handlers (window.onerror and frends) as a debugging/logging convenience, with the creation point of the request/transaction as the source info and error name as the message.

Error events can be cancelled (via preventDefault()). but (per spec) abort events cannot so they will always hit the global error handlers. To avoid harness errors when these go uncaught, tweak the `allow_uncaught_exception` testharness setting.

(Both affected tests currently fail in Firefox due to unrelated reasons, but other implementations are experimenting with onerror support. Tweaking the tests locally to pass in FF shows that the harness error is reported w/o this setup change.)

View on GitHub: https://github.com/w3c/web-platform-tests/pull/1774

Received on Thursday, 23 April 2015 23:06:07 UTC