Invoke AttachmentUploader and update AttachmentIds.

components/sync_driver/generic_change_processor.cc

Index: components/sync_driver/generic_change_processor.cc
diff --git a/components/sync_driver/generic_change_processor.cc b/components/sync_driver/generic_change_processor.cc
index 49889a69c1b2234b94d27826d40e9fa9cbc76ca3..42d5dd4006f9a4e396a254214266adf0e912aef5 100644
--- a/components/sync_driver/generic_change_processor.cc
+++ b/components/sync_driver/generic_change_processor.cc
@@ -103,10 +103,12 @@ GenericChangeProcessor::GenericChangeProcessor(
           attachment_service_weak_ptr_factory_.GetWeakPtr()) {
   DCHECK(CalledOnValidThread());
   DCHECK(attachment_service_);
+  attachment_service_->SetDelegate(this);
 }
 
 GenericChangeProcessor::~GenericChangeProcessor() {
   DCHECK(CalledOnValidThread());
+  attachment_service_->SetDelegate(NULL);
 }
 
 void GenericChangeProcessor::ApplyChangesFromSyncModel(
@@ -209,6 +211,12 @@ syncer::SyncError GenericChangeProcessor::UpdateDataTypeContext(
   return syncer::SyncError();
 }
 
+void GenericChangeProcessor::OnAttachmentUploaded(
+    const syncer::AttachmentId& attachment_id) {
+  syncer::WriteTransaction trans(FROM_HERE, share_handle());
+  trans.UpdateEntriesWithAttachmentId(attachment_id);
+}
+
 syncer::SyncError GenericChangeProcessor::GetAllSyncDataReturnError(
     syncer::ModelType type,
     syncer::SyncDataList* current_sync_data) const {