Invoke AttachmentUploader and update AttachmentIds.

components/sync_driver/generic_change_processor.h

Index: components/sync_driver/generic_change_processor.h
diff --git a/components/sync_driver/generic_change_processor.h b/components/sync_driver/generic_change_processor.h
index 9f55a53a8ee6c45e5aedcbf394a6b6b98a3912b5..fb3d910653f7c7e0990ae9fb0f1dabfecf47613d 100644
--- a/components/sync_driver/generic_change_processor.h
+++ b/components/sync_driver/generic_change_processor.h
@@ -39,6 +39,7 @@ namespace browser_sync {
 // be used on the same thread in which it was created.
 class GenericChangeProcessor : public ChangeProcessor,
                                public syncer::SyncChangeProcessor,
+                               public syncer::AttachmentService::Delegate,
                                public base::NonThreadSafe {
  public:
   // Create a change processor and connect it to the syncer.
@@ -71,6 +72,10 @@ class GenericChangeProcessor : public ChangeProcessor,
       syncer::SyncChangeProcessor::ContextRefreshStatus refresh_status,
       const std::string& context) OVERRIDE;
 
+  // syncer::AttachmentService::Delegate implementation.
+  virtual void OnAttachmentUploaded(
+      const syncer::AttachmentId& attachment_id) OVERRIDE;
+
   // Similar to above, but returns a SyncError for use by direct clients
   // of GenericChangeProcessor that may need more error visibility.
   virtual syncer::SyncError GetAllSyncDataReturnError(