GoogleChrome / lighthouse / 4430

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travis-ci

feat(DBW): add audit for detecting unoptimized images

Addresses one of several concerns around image bloat and another step towards PSI parity (#909).

Gathers all sameorigin or data URI images off of the network and runs them through canvas to determine a stripped down JPEG and WebP size.

Audit will fail if one of the conditions are met:
* There is at least one JPEG or bitmap image that was larger than canvas encoded JPEG.
* There is at least one image that would have saved more than 50KB by using WebP.
* The savings of moving all images to WebP is greater than 100KB.

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