Feature Compat: Access Mars

[cvan]

• https://accessmars.withgoogle.com
• Source code: https://github.com/googlecreativelab/access-mars

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• Firefox desktop for macOS: ✅ Works and performant
• Chrome desktop for macOS: ✅ Works and performant
• Chrome desktop for macOS with WebVR API Emulation Chrome browser extension: ❌ Doesn't work – filed issue: googlecreativelab/access-mars#2
• Google Cardboard for iOS: ❓ Positional tracking works, and movement seems to work for me; however, the scene seems to refresh the whole page out of nowhere every so often for me (will file an issue in the GitHub repo when I find reliable STR)
• Google Cardboard for Android:❓ I haven't tested this yet, but see this issue: https://github.com/googlecreativelab/access-mars/issues/1

[leweaver]

Also created an issue for Microsoft Edge support: https://github.com/googlecreativelab/access-mars/issues/3 (can enter VR, but there is no motion controller support)