Invoke AttachmentUploader and update AttachmentIds.

sync/internal_api/write_transaction.cc

Index: sync/internal_api/write_transaction.cc
diff --git a/sync/internal_api/write_transaction.cc b/sync/internal_api/write_transaction.cc
index b2dfe87da1785038367047bd1f0bb05b0f7d5eef..a730a50d95752fff21353a502341077b7e9c4b5a 100644
--- a/sync/internal_api/write_transaction.cc
+++ b/sync/internal_api/write_transaction.cc
@@ -5,6 +5,7 @@
 #include "sync/internal_api/public/write_transaction.h"
 
 #include "sync/syncable/directory.h"
+#include "sync/syncable/mutable_entry.h"
 #include "sync/syncable/syncable_write_transaction.h"
 
 namespace syncer {
@@ -80,4 +81,17 @@ void WriteTransaction::SetDataTypeContext(
   // See crbug.com/360280
 }
 
+void WriteTransaction::UpdateEntriesWithAttachmentId(
+    const AttachmentId& attachment_id) {
+  syncable::Directory::Metahandles handles;
+  GetDirectory()->GetMetahandlesByAttachmentId(
+      transaction_, attachment_id.GetProto(), &handles);
+  for (syncable::Directory::Metahandles::iterator iter = handles.begin();
+       iter != handles.end();
+       ++iter) {
+    syncable::MutableEntry entry(transaction_, syncable::GET_BY_HANDLE, *iter);
+    entry.UpdateAttachmentId(attachment_id.GetProto());
+  }
+}
+
 }  // namespace syncer