David Iglesias 0c2c7cfd15 Add web engine screenshot (scuba) tests (flutter/engine#12353)
* Import all golden files and tests from internal repo.
* Adapt test files to new screenshot API, and tweak some settings.

(Check PR to see individual changes to each file)

Fixes https://github.com/flutter/flutter/issues/40975
2019-09-20 09:00:55 -07:00
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