Merge "Cache nextPageTokens that a package can use." into sc-dev am: 1dd1ddc991 am: ccace3d566 am: 9b09bddb3b

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

Change-Id: I171fac5827235fc0aa6b8d8045b0cc2c0be73c88