Merge "Cache nextPageTokens that a package can use." into sc-dev am: 1dd1ddc991 am: 88149768d6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15190794

Change-Id: Ia92c43b25e3bab94b7130720ddc327292c7014c6