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

sync/api/attachments/fake_attachment_service.cc

Index: sync/api/attachments/fake_attachment_service.cc
diff --git a/sync/api/attachments/fake_attachment_service.cc b/sync/api/attachments/fake_attachment_service.cc
index 8e9e867f9ada7acde10079892cfde7cf2ff3a298..609c046a39598a91d00a497b73317933fe11b9e5 100644
--- a/sync/api/attachments/fake_attachment_service.cc
+++ b/sync/api/attachments/fake_attachment_service.cc
@@ -53,10 +53,15 @@ void FakeAttachmentService::DropAttachments(
                                      callback));
 }
 
-void FakeAttachmentService::OnSyncDataAdd(const SyncData& sync_data) {
+void FakeAttachmentService::StoreAttachments(const AttachmentList& attachments,
+                                             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).
+  attachment_store_->Write(attachments,
+                           base::Bind(&FakeAttachmentService::WriteDone,
+                                      weak_ptr_factory_.GetWeakPtr(),
+                                      callback));
+  // TODO(maniscalco): Ensure the linked attachments are schedule for upload to
+  // the server (bug 356351).
 }
 
 void FakeAttachmentService::OnSyncDataDelete(const SyncData& sync_data) {
@@ -101,4 +106,16 @@ void FakeAttachmentService::DropDone(const DropCallback& callback,
                                          base::Bind(callback, drop_result));
 }
 
+void FakeAttachmentService::WriteDone(const StoreCallback& callback,
+                                      const AttachmentStore::Result& result) {
+  AttachmentService::StoreResult store_result =
+      AttachmentService::STORE_UNSPECIFIED_ERROR;
+  if (result == AttachmentStore::SUCCESS) {
+    store_result = AttachmentService::STORE_SUCCESS;
+  }
+  // TODO(maniscalco): Deal with case where an error occurred (bug 361251).
+  base::MessageLoop::current()->PostTask(FROM_HERE,
+                                         base::Bind(callback, store_result));
+}
+
 }  // namespace syncer