Make class open for inherit

As discussed with Cassie, I'm cherry picking this CL in master to tm-qpr-dev to mitigate a merge conflicts in a CL of mine and also to prevent the two branches from diverging.

Bug: 261483935
Test: Manual
Change-Id: Ia29ad9684e5128c715b6e7948b7edec64d95f575
(cherry picked from commit f944cef6134109db6abc875a6ec9c0b4fce20018)
Merged-In: Ia29ad9684e5128c715b6e7948b7edec64d95f575
1 file changed