Trivial method renaming for notifyTextCommitted

This CL does not change existing behavior but only renames
notifyTextCommitted with notifyUserAction so that we can use
not only text commit but also other actions such as just typing
a character will be used as a trigger to update the IME
rotation order for better IME switching experience.

BUG: 7043015
Change-Id: I7f3e13a7226ef0dceee82b67e8a0d8536f7e9807