Keep track of the index we started at.
Keep track of the index we started at.

It is looking like more advanced merging will require keeping track of
where the index was last time we did a full advance.

Change-Id: Ief98b6b63eee3e1d7309e504ff7a6433a9d1b6a5

ecbaldwin/textile,ecbaldwin/textile,ecbaldwin/textile,ecbaldwin/textile