Created a subscriber function onLabelUpdated in the storage base class. The derived storage class will pass the label reference to the base storage class in the constructor. Future changes will use this label reference to update the label string with D3D. Bug: chromium:1164111 Change-Id: Ic5ca73bac61427afe392bb5bcc6a6eab8e785941 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2981451Reviewed-by: Rafael Cintron <rafael.cintron@microsoft.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
