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Implement text and drawable overlays · e6cb502b
Implements milestone 1.2 of the [overlays implementation plan](https://docs.google.com/document/d/1EcP2GN8k8N74hHZyD0KTqm9oQo5-W1dZMqIVyqVGtlo/edit#bookmark=id.76uzcie1dg9d) PiperOrigin-RevId: 493282868
tofunmi committed
