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We'll use this function to position the caret when the user taps a text input control. Very little of the code in this patch is actually new. Most of it is restoring code that we previously removed from the engine. I've made some small changes to the restored code to handle the lack of a DOM. The only major change is to RenderObject::createPositionWithAffinity, which now just returns the values it captures instead of trying to compute a DOM position. TextAffinity and TextPosition are lifted from package:flutter. Once this patch rolls into package:flutter, I'll remove the declarations there.