Keep track of which attachments are referenced by which sync entries.

sync/api/attachments/fake_attachment_service.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sync/api/attachments/fake_attachment_service.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/test/test_simple_task_runner.h"
 #include "sync/api/attachments/attachment.h"
@@ skipping 35 matching lines @@
 void FakeAttachmentService::DropAttachments(
     const AttachmentIdList& attachment_ids,
     const DropCallback& callback) {
   DCHECK(CalledOnValidThread());
   attachment_store_->Drop(attachment_ids,
                           base::Bind(&FakeAttachmentService::DropDone,
                                      weak_ptr_factory_.GetWeakPtr(),
                                      callback));
 }
 
-void FakeAttachmentService::OnSyncDataAdd(const SyncData& sync_data) {
+void FakeAttachmentService::StoreAttachments(const AttachmentList& attachment,
+                                             const StoreCallback& callback) {
   DCHECK(CalledOnValidThread());
   // TODO(maniscalco): Ensure the linked attachments get persisted in local
   // storage and schedule them for upload to the server (bug 356351).
 }
 
 void FakeAttachmentService::OnSyncDataDelete(const SyncData& sync_data) {
   DCHECK(CalledOnValidThread());
   // TODO(maniscalco): One or more of sync_data's attachments may no longer be
   // referenced anywhere. We should probably delete them at this point (bug
   // 356351).
@@ skipping 28 matching lines @@
       AttachmentService::DROP_UNSPECIFIED_ERROR;
   if (result == AttachmentStore::SUCCESS) {
     drop_result = AttachmentService::DROP_SUCCESS;
   }
   // TODO(maniscalco): Deal with case where an error occurred (bug 361251).
   base::MessageLoop::current()->PostTask(FROM_HERE,
                                          base::Bind(callback, drop_result));
 }
 
 }  // namespace syncer