Bug 1020847 - Add handwriting IME for Simplified Chinese.

We don't actually need to create this function. The `setDomElemTargetObject()` function establishes

    DOM <--> target object

And what we eventually need is

    DOM --> target object --> view instance

If you grep the code you would find `targetObjDomMap.get` is only used in a few places where render need to work on DOM directly w/o a view instance.

Therefore, I think you should be able to continue use `setDomElemTargetObject()` and do `viewMap.set(objRef, view)` at the same time (w/o this function).