This is similar to RES_FLTR_ANNOTATIONMARK, except that it'll be used
for WW8 import's smart tag bookmark needs.

First just add code so that WW8 import can put this this attribute on
the import stack, the actual handling of the attribute has to be
implemented later.

Change-Id: I92e3fac02496e3f5e7a6ea27f0da91dcd47769cc