Adding TextInputClient.currentAutofillScope property

Summary

Context

Description of change

Migration guide

Timeline

References

Summary

A new getter, TextInputClient.currentAutofillScope, was added to the
TextInputClient interface; all TextInputClient subclasses must 
provide a concrete implementation of currentAutofillScope.

This getter allows the TextInputClient to trigger an
autofill that involves multiple logically connected input
fields. For example, a “username” field can trigger an
autofill that fills both itself and the “password”
field associated with it.

Context