feat(BREAKING): Set DPR to 1 for Chrome headless browsers by default

[jennifer-shehane]

• close Set screen's device pixel ratio to a standard ratio for all browsers run headlessly via cypress run #17375

User facing changelog

• When running —headless Chromium based browsers via cypress run, the device pixel ratio will now be 1 by default, matching the behavior of all other browsers. This behavior can be overridden through the browser launch API [link to instructions on how to change this].

Additional Details

• This didn’t end up being as difficult as first suspected because it turns out Chrome is the only browser that is using the DPR of the machine it’s run in instead of just 1x.

User Experience

• People who were running in 2x machines (like a Mac retina) will see the resolution of their screenshots and videos reduced. This can be overridden.

[cypress-bot]

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[cypress]

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Test summary

4131 • 0 • 53 • 1 • 2

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Run details

Project	cypress
Status	Passed
Commit	9b8c676
Started	Jul 16, 2021 9:03 PM
Ended	Jul 16, 2021 9:13 PM
Duration	10:27 💡
OS	Linux Debian - 10.9
Browser	Firefox 89

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/commands/net_stubbing_spec.ts		2
1	network stubbing > intercepting request > can intercept utf-8 request bodies without crashing
2	... > automatically parses application/json response bodies

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