Prepare filter for moving to shared #9487
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Work towards #7793
In this CL, we are just preparing this code to be moved into shared code, but it is not shared here.
I tried to make as much private as possible. That is, when there are methods or fields that are currently only used privately, I make it private, with the idea it is not an API appropriate/necessary for public consumption. In a few cases, a method or field is used privately and in tests. In those cases, I made APIs
@visibleForTesting.I also adjusted comments a bit, as these will be published documentation.