Invoke AttachmentUploader and update AttachmentIds.

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 SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_H_
 #define SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 36 matching lines @@
   // The result of a StoreAttachments operation.
   enum StoreResult {
     STORE_SUCCESS,            // No error, all attachments stored (at least
                               // locally).
     STORE_UNSPECIFIED_ERROR,  // An unspecified error occurred. Some or all
                               // attachments may not have been stored.
   };
 
   typedef base::Callback<void(const StoreResult&)> StoreCallback;
 
+  // An interface that embedder code implements to be notified about different
+  // events that originate from AttachmentService.
+  // This interface will be called from the same thread AttachmentService was
+  // 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();
   virtual ~AttachmentService();
 
   // See SyncData::GetOrDownloadAttachments.
   virtual void GetOrDownloadAttachments(
       const AttachmentIdList& attachment_ids,
       const GetOrDownloadCallback& callback) = 0;
 
   // See SyncData::DropAttachments.
   virtual void DropAttachments(const AttachmentIdList& attachment_ids,
@@ skipping 14 matching lines @@
   // This method should be called when a SyncData is about to be updated so we
   // can remove unreferenced attachments from local storage and ensure new
   // attachments are persisted and uploaded to the sync server.
   virtual void OnSyncDataUpdate(const AttachmentIdList& old_attachment_ids,
                                 const SyncData& updated_sync_data) = 0;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_H_