[Sync] Expose change location in GenericChangeProcessor errors

sync/api/sync_change.cc

Index: sync/api/sync_change.cc
diff --git a/sync/api/sync_change.cc b/sync/api/sync_change.cc
index a9b9199d73df45e0fad6bd7412725201bce13726..8dedd9cb1768fbb0b3f99aebe8ae38e0cad773f7 100644
--- a/sync/api/sync_change.cc
+++ b/sync/api/sync_change.cc
@@ -52,6 +52,10 @@ SyncData SyncChange::sync_data() const {
   return sync_data_;
 }
 
+tracked_objects::Location SyncChange::location() const {
+  return location_;
+}
+
 // static
 std::string SyncChange::ChangeTypeToString(SyncChangeType change_type) {
   switch (change_type) {