Keyboard Events
Scope
The Sky keyboard API is intended to handle the following:
- reporting raw key down/up events from physical keyboards (“Alt” down, “E” down, “E” up, “Alt” up) 
- reporting simulated raw key down/up events from virtual keyboards, if the keyboard provides them 
- IME - reporting input text events from physical and virtual keyboards (“é”, autorepeat)
- inline editing of typed word
- backspace
- autocorrect
- editing around app-provided chips
- adjusting editor UI (line height, word spacing, etc)
- replacing selection
- providing per-phrase alternative interpretations
- composing letters
- composing words
 
API
TODO(ianh): Write API.