Merge "Provide a complete definition of FileBlobCache" into main am: 490fceeee0 am: 9fe12293e1

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2998285

Change-Id: I9089020b01632dea1557a0c281bca5e34234a339
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>