This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

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It appears we drop the result of sending a presentation connection message on the floor :-/

https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/presentation/PresentationConnection.cpp?rcl=0aca50f1552c882bc72ed5c419085fa975847a9c&l=528

Still work to be done here...