Invoke AttachmentUploader and update AttachmentIds.

sync/syncable/mutable_entry.h

Index: sync/syncable/mutable_entry.h
diff --git a/sync/syncable/mutable_entry.h b/sync/syncable/mutable_entry.h
index c064358082ec274331cc2bde4fcb36c6de12a7b5..9b9111366a102638ffcc54f4c355c6ace1c33979 100644
--- a/sync/syncable/mutable_entry.h
+++ b/sync/syncable/mutable_entry.h
@@ -62,6 +62,12 @@ class SYNC_EXPORT_PRIVATE MutableEntry : public ModelNeutralMutableEntry {
   void PutAttachmentMetadata(
       const sync_pb::AttachmentMetadata& attachment_metadata);
 
+  // Update attachment metadata, replace all records matching attachment id's
+  // unique id with updated attachment id that contains server info.
+  // Set is_in_server for corresponding records.
+  void UpdateAttachmentIdWithServerInfo(
+      const sync_pb::AttachmentIdProto& updated_attachment_id);
+
  private:
   // Kind of redundant. We should reduce the number of pointers
   // floating around if at all possible. Could we store this in Directory?