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Expose internal ability to retrieve rendering SurfaceControl
In order to coordinate what surfaces are being exposed on the screen, we need access to the SurfaceControl in order to access its layerId. While this works for systems such as ViewRootImpl, it is not available for SurfaceView. Flag: EXEMPT internal access Bug: 404617897 Test: Build and unit test Change-Id: I8a6e36a82640b7c65d3005d4449cc9d01cb705b9