AttachmentDownloader implementation.

sync/internal_api/attachments/fake_attachment_downloader.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/internal_api/public/attachments/fake_attachment_downloader.h"
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+
+namespace syncer {
+
+FakeAttachmentDownloader::FakeAttachmentDownloader() {
+}
+
+FakeAttachmentDownloader::~FakeAttachmentDownloader() {
+  DCHECK(CalledOnValidThread());
+}
+
+void FakeAttachmentDownloader::DownloadAttachment(
+    const AttachmentId& attachment_id,
+    const DownloadCallback& callback) {
+  DCHECK(CalledOnValidThread());
+  // This is happy fake downloader, it always successfully downloads empty
+  // attachment.
+  scoped_refptr<base::RefCountedMemory> data(new base::RefCountedBytes());
+  scoped_ptr<Attachment> attachment;
+  attachment.reset(
+      new Attachment(Attachment::CreateWithId(attachment_id, data)));
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(callback, DOWNLOAD_SUCCESS, base::Passed(&attachment)));
+}
+
+}  // namespace syncer