[in] Context information about the change to save.
pItemDataMerger
[in] An object that can be called by Sync Framework to merge changes. Can be NULL if no merging is required. It cannot be NULL if conflicts are resolved with the SRA_MERGE resolve action.
If the value is not NULL, Sync Framework will call IFeedItemDataMerger::MergeFeedItemData to merge FeedSync item data for any conflicts that are resolved with the SRA_MERGE action.