Have jest check for window errors in a similar to console.error logs. Fixes #8260#8278

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renderf0x wants to merge 1 commit intofacebook:masterfrom renderf0x:master

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Commits on Nov 13, 2016

Have jest check for window errors in a similar manner as is done for console.error calls. This ensures tests fail when errors are thrown in jsdom event handlers.
renderf0x
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