Chromium supports a lot of commands that aren't exposed in CEF. Rather than go through and add all the methods one by one, maybe it's worth making SendCommand accessible?
EditorCommand doesn't appear to have any public methods for validation (it doesn't internally from the quick check I did). So maybe just go without validation?
For my own reference later
https://cs.chromium.org/chromium/src/th ... Type&l=150
https://cs.chromium.org/chromium/src/th ... and.cpp&dr
I couldn't find any issues or old pull requests that addresses the topic. Feel free to ignore if it's already covered somewhere.