This next part of the stack will introduce the logic for updating the chat item height measurer to include the inline engagement in the message measurement. The order of operations for this next part of the stack will be correctly measuring the robotext message, then a text message, then finally a multimedia message.
The first diff introduces the dummy inline engagement component that will be a part of the heightMeasurerDummy which will get passed to the NodeHeightMeasurer. Subsequent diffs will handle updating the heightMeasurerKey function.
Depends on D8609