[Sync] Move attachments code out of core/.

components/sync/api/attachments/attachment_service.h

 // 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 COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_SERVICE_H_
-#define COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_SERVICE_H_
+#ifndef COMPONENTS_SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_H_
+#define COMPONENTS_SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "components/sync/api/attachments/attachment.h"
 
 namespace syncer {
 
+class AttachmentDownloader;
 class AttachmentStore;
+class AttachmentStoreForSync;
+class AttachmentUploader;
 class SyncData;
 
 // AttachmentService is responsible for managing a model type's attachments.
 //
 // Outside of sync code, AttachmentService shouldn't be used directly. Instead
 // use the functionality provided by SyncData and SyncChangeProcessor.
 //
 // Destroying this object does not necessarily cancel outstanding async
 // operations. If you need cancel like semantics, use WeakPtr in the callbacks.
 class AttachmentService {
@@ skipping 14 matching lines @@
   // created and called.
   class Delegate {
    public:
     virtual ~Delegate() {}
 
     // Attachment is uploaded to server and attachment_id is updated with server
     // url.
     virtual void OnAttachmentUploaded(const AttachmentId& attachment_id) = 0;
   };
 
-  AttachmentService();
+  // Create a concrete AttachmentService.
+  static std::unique_ptr<AttachmentService> Create(
+      std::unique_ptr<AttachmentStoreForSync> attachment_store,
+      std::unique_ptr<AttachmentUploader> attachment_uploader,
+      std::unique_ptr<AttachmentDownloader> attachment_downloader,
+      Delegate* delegate,
+      const base::TimeDelta& initial_backoff_delay,
+      const base::TimeDelta& max_backoff_delay);
+
+  // Create an AttachmentService suitable for use in tests.
+  static std::unique_ptr<AttachmentService> CreateForTest();
+
   virtual ~AttachmentService();
 
   // See SyncData::GetOrDownloadAttachments.
   virtual void GetOrDownloadAttachments(
       const AttachmentIdList& attachment_ids,
       const GetOrDownloadCallback& callback) = 0;
 
   // Schedules the attachments identified by |attachment_ids| to be uploaded to
   // the server.
   //
   // Assumes the attachments are already in the attachment store.
   //
   // A request to upload attachments is persistent in that uploads will be
   // automatically retried if transient errors occur.
   //
   // A request to upload attachments does not persist across restarts of Chrome.
   //
   // Invokes OnAttachmentUploaded on the Delegate (if provided).
   virtual void UploadAttachments(const AttachmentIdList& attachment_ids) = 0;
 };
 
 }  // namespace syncer
 
-#endif  // COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_SERVICE_H_
+#endif  // COMPONENTS_SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_H_