Update sync API to support attachments.

sync/api/attachments/fake_attachment_service.h

Index: sync/api/attachments/fake_attachment_service.h
diff --git a/sync/api/attachments/fake_attachment_service.h b/sync/api/attachments/fake_attachment_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..141f27517fe025319eb8a1381a94d76c25c815d6
--- /dev/null
+++ b/sync/api/attachments/fake_attachment_service.h
@@ -0,0 +1,52 @@
+// 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.
+
+#ifndef SYNC_API_ATTACHMENTS_FAKE_ATTACHMENT_SERVICE_H_
+#define SYNC_API_ATTACHMENTS_FAKE_ATTACHMENT_SERVICE_H_
+
+#include "base/memory/weak_ptr.h"
+#include "base/threading/non_thread_safe.h"
+#include "sync/api/attachments/attachment_service.h"
+#include "sync/api/attachments/attachment_service_base.h"
+#include "sync/api/attachments/attachment_service_proxy.h"
+#include "sync/api/attachments/attachment_store.h"
+
+namespace syncer {
+
+// A fake implementation of AttachmentService.
+class SYNC_EXPORT FakeAttachmentService : public AttachmentServiceBase,
+                                          public base::NonThreadSafe {
+ public:
+  explicit FakeAttachmentService(scoped_ptr<AttachmentStore> attachment_store);
+  virtual ~FakeAttachmentService();
+
+  // Create a FakeAttachmentService suitable for use in tests.
+  static scoped_ptr<syncer::AttachmentServiceBase> CreateForTest();
+
+  // AttachmentService implementation.
+  virtual void GetOrDownloadAttachments(const AttachmentIdList& attachment_ids,
+                                        const GetOrDownloadCallback& callback)
+      OVERRIDE;
+  virtual void DropAttachments(const AttachmentIdList& attachment_ids,
+                               const DropCallback& callback) OVERRIDE;
+  virtual void OnSyncDataAdd(const SyncData& sync_data) OVERRIDE;
+  virtual void OnSyncDataDelete(const SyncData& sync_data) OVERRIDE;
+  virtual void OnSyncDataUpdate(const AttachmentIdList& old_attachment_ids,
+                                const SyncData& updated_sync_data) OVERRIDE;
+
+  // AttachmentServiceBase implementation.
+  virtual base::WeakPtr<AttachmentServiceBase> AsWeakPtr() OVERRIDE;
+
+ private:
+  const scoped_ptr<AttachmentStore> attachment_store_;
+
+  // Must be last data member.
+  base::WeakPtrFactory<AttachmentServiceBase> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeAttachmentService);
+};
+
+}  // namespace syncer
+
+#endif  // SYNC_API_ATTACHMENTS_FAKE_ATTACHMENT_SERVICE_H_