[automerger skipped] Improve performance of generations in the resource cache...

[automerger skipped] Improve performance of generations in the resource cache am: d64b47c2 -s ours

am skip reason: Merged-In I5144f08bb38d0e600b7f556df834292e50afb91c with SHA-1 a9ef8767 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23730646



Change-Id: I1c5178ed311a2fbb78ad90319cff09bf10b91419
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>