The feature I was most interested in when they announced this last year was virtual time. The Developer Resources link has it listed (https://chromium.googlesource.com/chromium/src/+/lkgr/headle...) but it's a broken link, unfortunately.

Mostly, I'd like to know how the control of the virtual time system would be exposed. Would it be through the C++ API, or could it be made available through the debugging protocol?